Yoga 2 BIOS update v38

I just got my Y2P. Do I need to install this update? What does it do?

I'm a 'newbe' to this forum but will try to clarify in a non technical way. The BIOS contains the basic data for the pc to startup; as sort of brain stem with all the electronic DNA between the full function allowing the machine to boot (start up).
Updating the BIOS is rather like updating a programme to a revised version however 'flashing the BIOS is not without risk as it can destroy or corrupt vital data resulting in a boot failure mode.
I've just done my update and there was a concern. Upon completion it did not automatically reboot as the instructions indicated. I was left with a blank screen and keyboard illuminated. Very reluctant to switch off as this can destroy the BIOS completely. I contacted the support desk and indeed this seems to be a known problem of not completing reboot. Instructions werre to hold down the on/off button for at lest 8 seconds and it did indeed complete reboot successfully.
My tip is print off the instructions before you start so you can recognise the step by step process. It only lists seven steps but the Tech Support desk has others beyond that.(!/?)
Top marks to the UK technical help desk tele 0333 777 3991 (hope you wont need it!)

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Thinkpad Yoga BIOS Update Problem after installing Windows 10

Hi all, I've been reading tonnes of threads here trying to solve my problems (which seem to keep getting worse) to no avail. I'm reaching out to anyone that can suggest some help before I end up bricking my yoga by accident or running it over on purpose. I'll give you a timeline of the events. The machine in question is a Lenovo Thinkpad Yoga 12.5" 20CD-0032USIntel Core i5 4200U 1.60GHz Processor4GB Ram128GB SSDWindows 8.1 64 Bit preloaded (recently upgraded to Windows 10) So the saga begun just a short two days ago. I had some spare time at home and decided to download and install my free upgrade to Windows 10. I backed up all of my important documents etc to OneDrive as I intended on performing a clean install. Said clean install went flawlessly with Windows 10 installing the first time with no issues or errors. Since I had performed a clean install, all my previous apps, including the stock Lenovo apps, had been deleted. I had anticipated this and only really desired to reinstall the app that automatically adjusts the screen orientation when folding the cover back. So in an effort to find this app and any Windows 10 related updates that may be available I went to support.lenovo.com and used the handy Lenovo Bridge app to automatically detect my hardware and suggest relevant updates. While combing through the suggested software I noticed a BIOS update that noted added support for Windows 10. How great, I thought, that Lenovo would have a BIOS update ready so quickly once 10 became ready for mass consumption. I went ahead and downloaded the exe version (not the bootable CD due to the lack of CD drive on the Yoga) and ran the BIOS update. As I ran the update the laptop was plugged in, and no errors were presented, a success message appeared and indicated a reboot was necessary, after a couple seconds the system rebooted itself. Enter nightmare level 1. As soon as the system rebooted, I fired up IE about to look for more updates and......BSOD stating that there was and issue with a driver, after another reboot BSOD again with a completely different file name stating driver file missing or corrupt. Sorry I didn't write any of the file names or errors down. At this point I'm thinking that something is not jiving here between the BIOS and OS. So I tried running repair, and recovery and each time I would end up with a BSOD of some design. It was at this point I made a USB with the Windows 10 x64 ISO from Microsoft in an attempt to run the repair utilities from the USB. Again to no avail. Enter nightmare level 2 After attempting multiple tries at recovering Windows 10 and getting multiple BSOD's through the process I decided to use my Windows 10 USB to simply reformat my hard drive to eliminate any traces of my now apparently corrupt OS and do a fresh install of Windows 10. This appears to have been a significant error on my part. Now I have no OS (BIOS is still intact so at least I think I have a not-bricked motherboard) and everytime I try to boot Windows 10, or 8.1 for that matter, from a brand new USB stick I get constant BSOD's.Sometimes I get as far as the Preparing installation files 22% but am interrupted by a BSOD error at some point. So I am pleading for some help here. To me it seems like the BIOS update was the issue. I was not smart enough to have checked the BIOS version before updating so that I would know what to roll back to safely. What would you all recommend for a rollback and how do I go about doing one with no OS on the machine. I know I'm asking for a tl;dr here but appreciate any advice offered. I really dont want to get to nightmare level 3, which I guess would be a bricked laptop and a bill for a new motherboard or laptop. The BIOS I currently have is GQET45WW (1.25) -Garrett

Thanks for the reply ColonelONeill, It turns out that Lenovo uses an obscure PERL disk image called "eltorito". As such the directions in the link you provided did not work as most common tools (WinZip, 7zip, and WinRAR) cannot extract the image file from an eltorito iso file. I instead just bucked up for a $50.00 Asus USB CD drive and burned the iso for version 1.25 and 1.24 onto discs. I then disabled the setting in the BIOS that prevents rolling back to a previous version and flashed to 1.24 from the disc. While this appeared to go successfully, as soon as I tried to boot from my Windows 8.1 CD I start receiving BSOD's again during installation. I then used the CD with 1.25 to go back to where I was in case it was simply a bad BIOS update at the time. Most of the BSOD's are driver related (qlfcoei.sys) which I don't understand since there is no OS other than what is on the bootable CD (or USB I've tried both) Is there anyone with a stable install of Win 8.1 x64 or 10 x64 running on a 20CD0032US that can tell me what version of BIOS they are running? My next step is to go back to a version that someone else can verify is working. Thanks again for any help.

Yoga 2 Pro Went DEAD After BIOS Update

Had a horrible experience .. with good ending ... when upgrading Bios for my Yoga 2 Pro. So I'd like to share with others. I bought my Yoga 2 Pro last June (Man 3/22/14) and love it! But, it had problem restarting automatically after Windows Update. At least 3 times (That I can recall. Did not use it briefly from June 30 - July 22), the screen reminding user not to shutdown after Windows the update would stay on until I manually powered it down and restarted it. Last July 23, it did again after Windows Update. Searched Lenovo web-site and found a Bios Update for Yoga 2 Pro (Win 8.1 64-bit). Downloaded the new Bios (dated July 11, 2014) and went through the instruction striclty. First of, the screen responses were not at all as detailed in the instruction. So, the instruction is not very good. Received 2 warnings: Make sure the laptop is connected to the charger during the procedure, and the bios is for Yoga 2 Pro ONLY do not install it on any other models. As part fo the procedure, the laptop switched to a Bios Utility program. Again received the aforementioned warnings. Update progress was shown on the screen. All of a sudden, then screen went blank and the keyboard stayed lit. Waited for about 30 minutes. Still the same. Press and held the power button down (not sure for how long) ... nothing! Just no response from the latop. Called Tech support. She (the tech support lady) said that ... it is not recommended for user to go through the BIOS upgrade! What? Then why post it on Lenovo.com? She also said that I should not have downloaded software from the internet and upgrade, especially for BIOS. Well, I told her that I did not download the program from ANY web-site, I downloaded it from LENOVO.com. She said further that looks like the BIOS update had damaged my mother-board, there is a problem with Win 8 & 8.1, and because it was my own doing ... the damage would not be covered by the warranty! Considering the circumstance, Lenovo would waiver the initial $99 fee to assess the damage, but I would have to pay for any repair costs. In any case, I was so fumed at Lenove Tech Support responses that I hung up. close my laptop and put it aside. Almost 24 hours later, when the battery drained completely, I connected the laptop to the charger, press the power button to turn it on ... and ... to my surprise, the laptop booted and everything came back normal! The last (7/25) auto restart seemed to go well. Not sure if the auto restart problem is fixed with the new BIOS, but it seems to be. Time will tell.

Thank you for your posting. I searched the net when I ran into the problem, but could not find any help. Obviously, my search was not exhaustive. I was trying to make the following: a. Lenov should be more specific in their BIOS update instruction. Their instruction was ... far ... far from reality. b. Lenovo tech assistance was ... not much help. After listening to the description of my prolem, the tech lady immediately said that the operation must have damaged the mother-board, and that the operation is not ... recommended. No guidance on draining the battery a or how to restart the machine, etc... What I received was confusing that caused more panic! As a note, I had done BIOS upgrade on DELL PC/laptop before w/o any problem. I fully understand the implication of a BIOS upgrade, but trusted that manufacturer fully tested whatever that they post in their web-site. Oh well, live ... and learn! All in all, the Yoga 2 Pro is a great machine and I love it! Hope that anyone who runs into the same problem will be able to get the needed help in time! Cheers,

Yoga 2 Pro : BIOS Update on a clean Windows 8.1 Pro install

Hi,
I recently bought the Yoga 2 Pro. Like everybody I have the yellow problem.
After buying it, I reinstalled my computer with a fresh Windows 8.1 pro install.
I was wondering if anybody has already tried updating the BIOS on a clean Windows 8.1 install ?
And also if there is any reported bug with the BIOS update.
I already crashed a while back one of my previous computer and I would prefer if this don't append again
Thanks,
Best,

Not, i'm speaking about the BIOS update. The windows 8.1 pro installation was fine.

Thinkpad Yoga 12 BIOS update disables cooling fan

This sounds a lot like a prior thread about porblems with BIOS 1.08, but that thread ended up marked as solved, while for me the issue returned on the latest BIOS update to 1.12. My CPU temp got up to 92C without the fan coming on. Conclusion: there still seems to be some kind of condition where the BIOS completely disables all cooling. I think it's the same problem as that earlier thread, and it's clearly not solved. Thankfully it IS possible to get out of this state by rolling back the BIOS version to the one that worked, instructions are posted here and three posts below that for further clarification. Symptoms: you start noticing that the TPY gets oddly hot during normal use, or it experiences a forced shutdown due to overheating. It's also completely quiet. But: the fan itself is operational because you hear it briefly spin up during cold boot. Given that LoneSentry mentioned that the problematic BIOS 1.08 did work on second install, there seems to be some 'random' glitch in the update process or in the BIOS. Meanwhile I'm pretty unhappy that I'm having to do continued truobleshooting on this machine. Edit: going to the BIOS update page I saw that a newer BIOS was available (1.13), which you can install without having to disable Secure Rollback. Lo and behold. the fan is working again. The fan started blowing full speed right at the start of the EC flashing procedure. This is NOT a solution though, since this issue seems to have persisted until BIOS 1.12, and I have no reason to believe that it won't reappear on a future update.

paraloid wrote:
Well here I am on the new thread as well - and like heck the issue was resolved on the old thread. As mentioned before by myself and others on the other thread, I would update the BIOS, the fan would work for a while, then it would stop again until I updated the BIOS yet again.HOWEVER, thinking on this, and a variety of other problems I've been having with the TP Yoga (a whole lot - such buggy software), I remembered from my T61 days that the Lenovo System Update software is pretty hit and miss with finding updates. So I went to the Lenovo downloads page for the TP Yoga and indeed found a lot of software not passed onto me by the System Update.Amongst these was (TA-DA !) a utility "Lenovo Fan Test for Windows". I thought it would be useful to install in any case to test if the fan was operating properly (it was not part of the standard suite of diagnostic tools provided on my computer).Anyway since I installed it my fan has worked !!! - but only when my computer is plugged in, though this I believe is because I am using Lenovo Power Optimized (Lenovo Power Manager was another software on the site not provided to me via System Update) which I believe relies on passive cooling (throttling back processor) when only battery power is available. But now TpFan works all the time, though only in smart mode, and when I plug in the power to stream a video the computer doesn't reach boiling point and then shut down.Interesting. My fan diagnostic comes up as unavailable...

Yoga 13 - BIOS update kills Intel RST

My Yoga 13 had the fan noise issue and I ran the recent fan embedded controller (EC) update to 66EC42WW from the Knowledgebase article. My BIOS is at 66CN52WW after the Jan 28 BIOS update (66cn52ww.exe). After the EC update and a cold boot I get the error message that Intel RST is no longer properly supported on my Yoga 13. Also, there is no longer a BIOS setting to enable/disable Intel RST.
I uninstalled and tried to reinstall Intel RST, but get an error message that the system does not support it. I suppose this is due to the BIOS setting missing. I then went to the Yoga 13 driver page to see if there were any newer/older BIOS files and the Jan 28 BIOS update is now TOTALLY gone.
So, a few questions:
1. Was there an issue with BIOS update 66CN52WW that forced the update to be pulled?
2. If so, what were the problems?
2. If the BIOS did have problems for those of us who applied the update, is there an older BIOS file we can reflash to restore Intel RST?
3. If we do reflash with an older BIOS what should we do about the fan update? Go back to the original or keep the new one?
Thanks for your input.

Thanks. As I mentioned in my post I have uninstalled RST, and the PC runs fine. In researching the effects/benefits of RST it seems it enables a faster restarting hibernate mode that uses less battery power than the normal Windows sleep. This may be important when traveling and away from an electrical outlet for a while.

Yoga 3 Pro BIOS Update A6CN47WW

Someone knows whats better with this Bios Update?
Solved!
Go to Solution.

According to the support site:
Summary of changes
==================
General Information:
A6CN47WW
1. Add security patch for UEFI
2. Support 5Y71&5Y51
Source: http://support.lenovo.com/us/en/products/laptops-and-netbooks/yoga-series/yoga-3-pro-1370-laptop-len...
/L40SX/240/240X/2*340CSE/360PE/365XD/380D/380E/380XD/380Z/390/560E/560X/2*570/2*600/600E/750Cs/755C/760CD/760EL/760XD/770E/A20p/A22p
A31/i1600/G40/R50p/R61i/S30/SL510/2*T22/4*T4x/11*T6x/6*T4x0x/6*T5x0/3*W5x0/W700/3*X2x/4*X3x/3*X4x/5*X6x/3*X6xT/10*X2xx/2*X200T/4*X30x/Z60m/3*Z61x
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X240 will not boot after latest bios update

I bought windows 8 .1 machine from factory. Then I had local shop install 8.1 on larger ssd. I just performed latest bios update and now machine will not boot. I am sure this is uefi related but I am not knowledgable in that area. The boot parameter returned to me by the shop was "legacy only" and secure boot was disabled.
Solved!
Go to Solution.

StanFan wrote:
I bought windows 8 .1 machine from factory. Then I had local shop install 8.1 on larger ssd. I just performed latest bios update and now machine will not boot. I am sure this is uefi related but I am not knowledgable in that area. The boot parameter returned to me by the shop was "legacy only" and secure boot was disabled.
Since doing the BIOS update are the settings still as you noted above? You also didn't mention which SSD is now installed in the system.
Just as an aside, installing Windows 8.1 in legacy mode isn't exactly optimal. Were there any particular reasons for this? Just being curious.
Andy ______________________________________
Please remember to come back and mark the post that you feel solved your question as the solution, it earns the member + points
Did you find a post helpfull? You can thank the member by clicking on the star to the left awarding them Kudos Please add your type, model number and OS to your signature, it helps to help you. Forum Search Option T430 2347-G7U W8 x64, Yoga 10 HD+, Tablet 1838-2BG, T61p 6460-67G W7 x64, T43p 2668-G2G XP, T23 2647-9LG XP, plus a few more. FYI Unsolicited Personal Messages will be ignored.
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Win 7 Pro 64bit - BIOS Update Failure 2ACN37WW

G'day Genlemen,
I am upgrading to 2g RAM and need to update my BIOS. However I am not able to get the program to run from Windows 7 Pro 64bit. I am trying to install 2ACN37WW.exe
When I open the program as administator it pops up for a second and disappears, I've tried running it in compatibility mode which doesn't help.
Do I need to be using a 32bit OS for the 2ACN37WW.exe to run in Windows? I have followed the txt instructions exactly.
Is there another way I can update to 2ACN37WW outside of Windows? Like the Thinkpad T serious CD BIOS update method?
IdeaPad S10-3 (064757M)
S/N:xxxxxxxxxx
Thanks,
Smack
Edit by Mod Dont show your Serial in public to prevend your privacy

Hi and welcome,
there are a few methods you can use.. via bootable usb memory stick or card &
http://www.nu2.nu/pebuilder/
sincerely KalvinKlein
Thinkies 2x X200s/X301 8GB 256GB SSD @ Win 7 64
Ideas Centre A520 ,Yoga 2 256GB SSD,Yoga 2 tablet @ Win 8.1

G530-4446-24U takes FOREVER to POST after BIOS update

Hey,
I just installed Win7 Pro 64-bit a couple of hours ago and lost the ability to adjust my screen brightness. After installing chipset and power management drivers I still had no luck. So I updated the BIOS with this file.
Now it all works well once I'm booted into Win7, but it takes a very long time to POST when I push the power button. I haven't timed it, but it seems to be over 60 seconds before I have anything displayed on my screen. When it does start POST, it works fine at the expected speed. It also restarts when attempting to wake from sleep, and the same problem as mentioned above applies as it must POST again.
Is there a more appropriate BIOS update for my machine, or is this a terrible bug that must be worked out?
Thanks in advance.
Solved!
Go to Solution.

I couldnt flash either from Windows 7 pro x64. I ended up using BartsPE to run the flashing program. I dont have the speed issue, it boots up with the same speed it always did. you should make sure you used the right BIOS. i had the problem once, but it seems to be working now. I still havent gotten the Brightness to work though.
as for the "Cannot load driver C:\Drivers\BIOS\6get18ww\PHLASHNT.SYS. Please check your accounts, if you have no administrator privilige, please login again! This driver has been blocked from loadingError code: 1275" message, this is because it uses a 32 bit driver. You cant use these drivers under 64 bit. my solution worked really well. if you want to use and need help configuring the PE, i can help.
W530(2436-CTO): i7-3720QM, nVidia Quadro K2000M,16GB RAM, 500 GB hard drive, 128GB mSATA SSD, Ubuntu 14.04 Gnome, Centrino Ultimate-N 6300.
Yoga 3 Pro: Intel Core-M 5Y70, Intel HD 5300, 8GB RAM, 128GB eMMC, Windows 8.1, Broadcom Wireless 802.11ac.

Where can i find Bios Update for K450e

Hi can anyone direct me where i can find the BIOS update for a K450e thanks.... a link would be great....

There is no bios update for the k450e on there driver page
The only time there will be is to fix a conflict between hardware
are you having a problem with your k450e
Thx dave
yoga 2, lenovo b540
3 custom gaming pc systems

U530 bios update fails.

I have downloaded a new verios of bios update (7ccn35ww) but I am unable to update the bios. Every time I run the tool, it automatically restarts the system and tries to update, when it complains that "Update failed. Secure Flash"
Does anyone know why ?

aminvali wrote:
I have downloaded a new verios of bios update (7ccn35ww) but I am unable to update the bios. Every time I run the tool, it automatically restarts the system and tries to update, when it complains that "Update failed. Secure Flash"
Does anyone know why ?
Hi aminvali,
      Just to cover all the bases, what is your current BIOS? When did you purchase your U530? To find your current BIOS, just spam F2 upon a cold boot, and enter the BIOS utility. If you have Win 8, see this article:
https://forums.lenovo.com/t5/Windows-8-and-8-1-Knowledge-Base/How-to-get-into-BIOS-in-Windows-8/ta-p...
     The reason I ask, is because if your U530 was bought in the last few months, you could already have the 7CNN35WW BIOS loaded in your system. Lenovo usually loads the last BIOS available to them in the manufacturing plant, before they post it on their support site. Hence, if you try to flash the same BIOS you already have loaded, it will generate an error.
     Please report back with your results.
Edit: Also, assuming that 35WW file is a new BIOS for your system, when you downloaded the file, did you put it in the Lenovo D: drive?
Have you tried this:
Turn off the comupter. Enter BIOS. Change boot mode from UEFI to Legacy on the last tab. Save changes. Boot Windows. Run update file again. After successfull update return your BIOS settings back
Cheers
DragonRider
I'm DO'ing IT
Lenovo Y470 085525U 2nd generation Intel® Core™ i7-2630QM processor ( 2.00GHz 1333MHz 6MB )
IdeaCentre A520 Intel® Core™ i5-3230M processor ( 2.60GHz 2600MHz 3MB )
YOGA Tablet 2 Pro-1380F
X1 Carbon 2nd Gen (20A8) ThinkPad + T420

Lost ATI CCC after bios update

I clicked on "system update"(ThinkVantage3) in the start menu. Then "get new updates", It recommended a bios update so I installed it. Now, it replaced the ATI CCC icon in the task bar with a Intel(R) Graphics Media Accelerator Driver for Mobility" icon. I checked and it now says I have a ATI FireGL V5700 graphics card as opposed to the ATI Mobility Radeon HD 3650 before the update. Also, when I click on the ATI Catalyst Control Center program in the start menu, it says, "ATI CCC cannot be started because the currently active GPU is not supported". How do I fix this? Or, how do I uninstall this update? I can't change the screen resolution or any of the other graphics features.

Hello,
please try to download newest Ati drivers from Lenovo support pages.
Regardings bios update:
Version 1.18-1.01
[Important] An incorrect display adapter name is displayed on ATI FireGL V5700 model (ThinkPad W500). Note: Make sure that you have updated the display driver with the following version before BIOS update. -ThinkPad Switchable Graphics Driver for Windows Vista Version 8.52.4.4-080919a-069896C-Lenovo (7vd535ww) or later or -ATI Display Driver for Windows XP Version 8.503.2.2-080818a-069536C-Lenovo (7yd119ww) or later Or you will be asked for an appropriate driver for a newly found hardware device and the display may be VGA(640x480) mode. In VGA mode, your icon arragement on the desktop will be messed up.
(Fix) The external display may have blank screen when the computer is attached to the Docking Station with the LCD closed and then is powered on.
(Fix) Serial ATA Controller mode option setting is set as wrong value via WMI interface.
Message Edited by Agotthelf on 12-11-2008 09:54 AM
Follow @LenovoForums on Twitter! Try the forum search, before first posting: Forum Search Option
Please insert your type, model (not S/N) number and used OS in your posts.
I´m a volunteer here using New X1 Carbon, ThinkPad Yoga, Yoga 11s, Yoga 13, T430s,T510, X220t, IdeaCentre B540.
TIP: If your computer runs satisfactorily now, it may not be necessary to update the system.
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Bios update gone bad

I have a T60 and I just tried to update the BIOS using the following utility from Lenovo:
Version:                  7IET33WW (1.14)
Release Date:        2008/04/25
File link                   7iuj12us.exe
File size                  2,781,304
File description     ThinkPad BIOS update utility
After the utility completed the update, I followed the instructions to restart and verify the version. After hitting F1, I am presented with a lock icon which has a screen beside it, which I believe to be a prompt for a power on password. Not knowing what it is since I never had one set up, I try my windows password and that of my wife's which we use on the computer (set up when we set up the fingerprint log -in). Nothing works. I can hit enter and access the BIOS setup, but no changes can be made in "user mode" (I never set up a Supervisor password either).
I did read/try the solution which Mark_Lenovo (Admin) posted in other threads regarding removing the battery and backup battery, but it did not work. What is funny is that the power on password is only requested when trying to access the BIOS, I can log on and use the computer normally with the fingerprint reader. I just can not access the BIOS.
I am hoping others who had similar problems might have had better guidance on how to proceed. My initial call to Lenovo proved to be less than comforting stating that even the POP can not be reset and can only be fixed by MB replacement at my cost.
Thanks in advance for any help.
System is a T60, type 8743, WinXP, T7200, 2Gb, current BIOS after update 1.14 (7IET33WW) dated 2008-04-16, Embedded Controller Ver 1.07, old BIOS version unknown, system build Dec 2007.
Calvin

Calvin, welcome to the forum,
I'm sorry; this subject is not allowed to be discussed here as stated in the forum rules - Thread locked
No posts shall include instructions or directions intended to subvert security measures, including passwords, locking mechanisms, fingerprint scans, etc, nor shall any posts provide descriptions to the location of, nor direct links to content related to these topics.
Andy ______________________________________
Please remember to come back and mark the post that you feel solved your question as the solution, it earns the member + points
Did you find a post helpfull? You can thank the member by clicking on the star to the left awarding them Kudos Please add your type, model number and OS to your signature, it helps to help you. Forum Search Option T430 2347-G7U W8 x64, Yoga 10 HD+, Tablet 1838-2BG, T61p 6460-67G W7 x64, T43p 2668-G2G XP, T23 2647-9LG XP, plus a few more. FYI Unsolicited Personal Messages will be ignored.
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X121e doesn't boot after BIOS update

Hello everybody,
I am experiencing following problem with my Lenovo X121e Laptop.
After suffering problems with the Fn-keys on my Laptop, I yesterday decided to give it a shot and upgrade my BIOS for 1.06 to 1.11. I downloaded the BIOS update package from the Lenovo website and startet flashing using WinFlash. Flash progress went fine, ending in the WinFlash shutting down and innitiating a reboot. After Windows had shut down, the Display remained black, not giving me a chance even to reach the BIOS.
I have already tried to start up the Laptop without AC and battery pack, but no change. Even tried to hold the power button for about 60 seconds when having the Laptop disconnected from AC and battery, nothing.
Can anybody tell me what happend to my X121e and how I can get it working again ? Or is it a case for warranty now ? I
Thanks for helpful answers in advance.

http://gluek.info/wiki/hardware/howto-enter-bios-hotkeys
You probably already tried these.
Dave
Special additional keys for USB boot:
Press SHIFT-u to force USB 1.1
Press CTRL-u to wait for a keypress before starting the operating system. When a drive was found, then you can press "s" to skip the device or you can boot from the drive.
Press ALT-u to wait for a keypress before detecting the usb device type. When a device was found, then you can press "s" to skip the device or you can boot from the device when its as mass storage device.
T430u, x301, x200T, x61T, x61, x32, x41T, x40, U160, ThinkPad Tablet 1838-22R, Z500 touch, Yoga Tab 2 Windows 8.1, Yoga Tablet 3 Pro
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Yoga 2 BIOS update v38

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