CMOS checksum invalid. CMOS 502 Error.

Product name: HP ENVY TS 15 J127TX Touch Notebook PC
Product number: F7Q47PA#AB4
BIOS Version: F.56
OS: Windows 8.1
It happened after a BIOS update which had resulted in the laptop not booting. A successful message was displayed instead. The BIOS version is F.56 and is currently the latest on the support page. Ironically, the description says the update "Fixes an intermittent issue where the system does not restart the operating system properly after the BIOS is upgraded." The capslock LED would flash twice and refuse to start. Suggestions I got from forums were to reset the CMOS.
What I did:
1. Remove the flat battery and waited a while before I re-inserted it.
2. Held down the power key for 30s.
3. Connected to cord and powered up.
The laptop was fine for 2 weeks till Windows got stuck in a repair loop. I had to refresh Windows to get it to boot. I had also restored from a system image I did with Paragon HDM and no problems for another week.
For no apparent reason, the CMOS error was displayed few days ago. There were also no changes made to the system.
I've tried many times to reflash again and followed by a hard reset after each of them with no success. I've also replaced the battery even though I didn't think it would be flat so quickly for a 6-month old laptop.
Questions:
1. Would a reset to factory default restore a working BIOS?
2. Would the "Rollback" feature in "Firmware Management" in Diagnostic be sufficient instead?
3. I did attempt to do a "Rollback" but there was no firmware found. I explored the recovery partition and the folder labeled as "previous" under the "Bios" directory was indeed empty. Would the "Rollback" work if a good firmware is copied to the folder? What are the files to use and how do I get them?
A factory reset is the last thing I want to do so please advise if there are other options.
"If it's ain't broke, don't fix it".
PS. I had initially sent this using the "Contact HP" page but received a reply informing me that there's no email support for my laptop. Why didn't it stop me before I wasted my time typing the message?

I have searched through most models in the Envy 15 J100 series. All list only BIOS F.56 for download.
Since it is a weekend there are not likely to be any HP employees online here. Maybe Monday.
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Hello , Welcome to the HP Support Forums! It is a great place to find the help you need, both from other users, HP experts and other support personnel. I read your post about the BIOS, and wanted to assist you! Here are a few things you can try. Start with a Hard Reset. Then try using the HP Support Assistant to install any necessary drivers. Check the Windows Update as well. If you are having trouble finding or installing updates, then you can use this site to help: Open the Windows Update troubleshooter
You can always perform a System Recovery to put the notebook back to its factory settings. Also, please review the following document, as it may help to resolve the issue for you: HP PCs - HP BIOS Application Selected Is Corrupt or Missing If you are still having trouble, or would like to contact HP Phone Support, you can do so with the following link: http://www.hp.com/contacthp If you live outside the US/Canada, please click the link below to get the contact information for your region.
http://www8.hp.com/us/en/contact-hp/ww-phone-assist.html Please let me know if this information was helpful by clicking the thumbs up below.
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Yesterday i desperate enough and change some BIOS settings, and
surprisingly, the CPU is much cooler!
Try entering bios, hitting f6 for optimized defaults then save and exit. See if problem persists.
Quote
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4-Channel 12V Rails Design
Although the VGA you list only needs 24a on a 12v rail.
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what's cpuid / ram timings / spd? where i can look at it?
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The large print: please read the Community Participation Rules before posting. Include as much information as possible: model, machine type, operating system, and a descriptive subject line. Do not include personal information: serial number, telephone number, email address, etc. The fine print: I do not work for, nor do I speak for Lenovo. Unsolicited private messages will be ignored. ... GeezBlog
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The large print: please read the Community Participation Rules before posting. Include as much information as possible: model, machine type, operating system, and a descriptive subject line. Do not include personal information: serial number, telephone number, email address, etc. The fine print: I do not work for, nor do I speak for Lenovo. Unsolicited private messages will be ignored. ... GeezBlog
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Quote
I understood that I'm forced to flash the bios again using the MSI Forum HQ USB Flashing Tool mentioned in that topic.
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Quote
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Quote from: syar2003 on 26-January-06, 02:02:49
What's so hard to understand .
clear cmos erases it/all data , no valid checksum exist after this .
cmos is then loaded with bios defaults from the bios chip , but checksum is still not valid until cmos is saved .
Only way to get valid checksum again it to save cmos settings from the "cmos setup menu" .
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Hello!
Please list your components. Include the PSU.
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First make sure you are using correct recovery CD. Like if the model is ACS1112 then we need to use 1112 recovery and NOT 1113 or 1111.
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CMOS checksum invalid. CMOS 502 Error.

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