Unable to restore iPhone. error code 21

I am unable to restore my iPhone through iTunes. I keep getting an error code 21 after trying recovery mode. please help, I've followed work around instructions on apple, but no luck. Also because the phone will not turn on I am unable to locate serial number for the device.

If you have tried the troubleshooting steps outlined in this article for Error 21 unsuccessfully, then you will need to contact Apple Support to get help:
Resolve specific iTunes update and restore errors
https://www.apple.com/support/contact/
Best of luck,
GB

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TS3694 unable to restore iphone error code 3194 keeps coming up what do i do?

unable to restore iphone 4 - error code 3194 keeps coming up what do i do ?

Error 1004, 1013, 1638, 3014, 3194: These errors may be the result of the connection to gs.apple.com being redirected or blocked. Follow these steps to resolve these errors:
Install the latest version of iTunes.
Check security software. Ensure that communication to gs.apple.com is allowed. Follow this article for assistance with security software. iTunes for Windows: Troubleshooting security software issues.
Check the hosts file. The restore will fail if there is an active entry to redirect gs.apple.com. FollowiTunes: Advanced iTunes Store troubleshooting to edit the hosts file or revert to a default hosts file. See section "Blocked by configuration: (Mac OS X/Windows) > Rebuild network information".
Try to restore from another known-good computer and network.
If the errors persist on another computer, the device may need service.

HT201210 unable to restore 3gs, error code -1 comes up at end of firmware restore

I am trying to restore my Iphone 3gs, unfortunately when the restore reaches the end of firmware restore it seems to pause for a minute, i then get a message telling me that anunknown error has occured, error code (-1). i cant seem to find out what this error code means, I have put phone into DFU mode and restored again and again but always the same result. HELP

Do a search for error 1 at the top of the forum, this subject has been brought up numerous time in numerous threads. Look for the green check mark.

Trying to restore iPhone - error code 21

I am trying to restore an iphone using itunes and I keep getting the error code 21. The phone was dropped in water and dried and now it won't turn on or anything, it just displays the apple icon when on charge. I can get it into download mode in itunes by holding home key and power key and the restore starts but keeps coming up with the error code. I have followed everything on the apple supprt articles, have turned off firewall, deleted antivirus software, deleted temp folder, tried to edit the host file but it is empty (yes I am adminstrator user) and I still can't get past this error code. I have even tried it on a different computer and still having the same error code come up.
I ran the diagnostics in itunes and came back with the error that no device was connected - yet you can clearly see it in the panel on the left of itunes that there is an iphone connected.
When I do connect it to itunes, it goes to restore the phone, extracts the software and says its preparing phone for restore and this is where it stops each time. I am using the latest itunes and iphone firmware - both updated when I began this.
Can anyone please help with this? This phone is about to go for a long flight instead of a swim this time!!
Thanks

Hope you have managed to sort this now or did your phone go for a long flight? I have recently had the same problem, although mine is a 3GS rather than a 4 (but surely shouldn't make too much of a difference!) and have tried all the advice too but to no avail!
Shall I try again or just give up and buy another phone?
Thanks.

Unable to restore iPhone - Error 1603

Hi,
Used iTunes to update my iPhone 3Gs to the latest version and am currently stuck.
iPhone is in "ready to restore mode" (showing the connect to iTunes picture)
Am unable to restore the iPhone, when I press restore in iTunes, it prepares the device for restore, then after a while displays Error 1603.
I have tried restarting the computer, "hard restore" of my iPhone, reinstalling iTunes and also turning off my antivirus.
I have the latest version of iTunes installed and my operating system is up to date.
Appreciate any help as I am unable to receive any calls at the moment.
Cheers,
Brock

Thanks amy_lou.
I tried below steps as mentioned in link:
1) stop and start apple mobile service .
2)change administrator .
not sure which one worked but got my phone restored succesful .

Unable to restore iPhone 5S with iOS 8.2 (Error -1)

Unable to restore iPhone 5S with iOS 8.2 (Error -1)
I tried to install previous versions 8.0 and 7.0.3, it returns another error.
I tried with iTunes 12.1.1.4 and 11.2
Even in DFU mode its giving the same error.

Hey BBRemoshan,
Thanks for the question. If I understand correctly, you are trying to restore the iPhone and are getting errors. I would recommend that you read these articles, they may be helpful in troubleshooting your issue.
Resolve iOS update and restore errors in iTunes - Apple Support
Get help with iOS update and restore errors - Apple Support
Thanks for using Apple Support Communities.
Have a good one,
Mario

Unable to restore iphone 3gs to factory settings, unknown error occurred (-1) can anyone help

i am getting an error ...unable to restore iphone "iphone" unknown error ocurred (-1) and the iphone is stuck on itunes connection sign. any idea how i can restore factory setting it is ne iphone 3gs with ios 5

This is indicates a hardwre issue:
Check for hardware issues
Related errors: 1, 3, 10, 11, 12, 13, 14, 16, 20, 21, 23, 26, 27, 28, 29, 34, 35, 36, 37, 40, 1000, 1002, 1004, 1011, 1012, 1014, 1667, or 1669.
Try to restore your iOS device two more times while connected with a cable, computer, and network you know are good. Also, confirm your security software and settings are allowing communication between your device and update servers. If you still see the error message when you update or restore, contact Apple support.
Error 1015 might happen after making unauthorized modifications to iOS, also called "jailbreaking."
Use recovery mode to restore your device
Related errors: 1015, “The required resource can't be found.”
You might see these error messages if your device has a beta version of iOS or if you're installing an older version of iOS (downgrading). Use recovery mode to restore your device to the latest version of iOS.
Quit virtualization software
Quit any virtualization software (such as Parallels or VMware) that’s running on your Mac. Then use the latest version of iTunes to restore your device.
Resolve specific iTunes update and restore errors

My iphone wont turn on or restore,HELP error code 1015

My iphone wont turn on or restore,HELP error code 1015

jailbroken? if so we can't help here, try google.

HT4061 unable to restore iphone

Hi, I connected my iphone 4 to my computer to update and now receive an error on my computer "unable to restore iphone" and nothing on my phone works now. appreciate any help

For a Windows PC: iOS: Device not recognized in iTunes for Windows - Support - Apple
For a Mac: iOS: Device not recognized in iTunes for Mac OS X - Support - Apple

Cannot Restore iPad2 - Error Code 3173?

Never had an issue with an Apple product before.
Windows 7 Home Premium
iTunes 10.5.0.142
iPad 4.3.5
Attempted to update iPad software to 5.0 and got the error code "cannot restore iPad - error code 3173"
Freaked out and disconnected the iPad and it seems fine, no data/information loss and it DID NOT update as it is still running version 4.3.5.
No other external USB ports in use, never had an issue updating previously.
Thoughts/ideas/fix? Seems like a lot of people are posting asking for help with this but I don't see a fix anywhere.

Good idea. I wish I had waited. My iPad2 will not Restore so it is hammered. My iPhone 3Gs is updating now so we'll see. But this is definately an Appple problem as all 5 devices at our house had one issue or another. My iPad2 fails with the unrelated error 1162. The USB driver does not install. For my iPhone 3Gs, the USB driver installed and the update is nearly complete. Oh, it's backing up now. I'll just have to see if it works but it is going much better than our iPads. The iPads seem to be the big issue.

HT201263 Hi. I forgot my passcode and now I am unable to unlock my ipod. I tried restoring it using itunes in recovery mode as well as dfu mode but it says unable to restore,unknown error occured (3004). Please help me out. My ipod is locked for one hour

Hi. I forgot my passcode and now I am unable to unlock my ipod. I tried restoring it using itunes in recovery mode as well as dfu mode but it says unable to restore,unknown error occured (3004). Please help me out. My ipod is locked for one hour now.

Locked Out, Forgot Lock or Restrictions Passcode, or Need to Restore Your Device: Several Alternative Solutions
1. iOS- Forgotten passcode or device disabled after entering wrong passcode
2. iPhone, iPad, iPod touch: Wrong passcode results in red disabled screen
3. Restoring iPod touch after forgotten passcode
4. What to Do If You've Forgotten Your iPhone's Passcode
5. iOS- Understanding passcodes
6. iTunes 10 for Mac- Update and restore software on iPod, iPhone, or iPad
Forgotten Restrictions Passcode Help
You will need to restore your device as New to remove a Restrictions passcode. Go through the normal process to restore your device, but when you see the options to restore as New or from a backup, be sure to choose New.
Also, see iTunes- Restoring iOS software.

Unable to restore iPhone 6

i'm unable to restore iPhone after it was blocked mistakenly typing wrong pass code while the display was broken. please suggest how to restore.

Hello Zaiduzamaan,
Thanks for using Apple Support Communities.
If you have a message on your iPhone that it is disabled, then you will need to erase it by following any of the methods outlined in the article below.
Forgot passcode for your iPhone, iPad, or iPod touch, or your device is disabled - Apple Support
Take care,
Alex H.

I tried to charge my iPod Touch 5th generation but it died while charging and it was tuning and it said i had to connect to iTunes so i did and i had to restore it to use it and while restoring an error code (9) appered and i can't use it. Plz help

   So I was using my iPod Touch 5th generation and the charger wouldnt charge it and it died then while it was in the process of tuening back on the apple logo dissapeered and it kept on turning on and off so i put it into DFU mode and it said to plug it into itunes to i did and it said i had to restore it to use it but when i tried to restore it it brought up ," Couldnt restore ipod, error code (9) " ..... and i have tried 3 different USB cables and two different computers and USB ports and i have no clue what to do so i would like help from anyone please that would be awesome!!!!
                    Thank you,
                                       Zac

Zac henderson wrote:
...Couldnt restore ipod, error code (9) " ...
Try here > Configure security software

HP recovery could not restore computer error code 0xe0ef000e

I bought a nice Solid State drive. Unfortunately it is not possible to upgrade my system to new hard drive. It fails every time with HP recovery could not restore computer error code 0xe0ef000e. This is after removing everything... graphics card, ram, cd drive... nothing is plugged in except the keyboard, monitor and mouse.
Windows 8 strikes again. Does anyone have any suggestions about how to actually use the recovery disks to reinstall windows 8 onto a new solid state drive. I hate this computer and wish I would have never bought it actually. It's been nothing but crap from day one.

It's the HP 500-023w desktop. I ended up just buying a Winodws 8.1 OEM disk and installing that on the SSD. The recovery tool is a bit useless. Reading through various forum posts it seems I would have ended up spending hours trying to figure it out or else buying the recovery disks from HP. Just paying $89 for an OEM disk is a good deal by comparison since at the very least the computer has no bloatware on it now.
What a hugely unnecessary hassle really. Now if only I could get this heap of junk to boot with a PCI-e graphics card installed I might actually be able to use it with two monitors. Good grief.

Email address hacked via iphone. iphone locked home screen displaying my email password! and has been reset. now unable to restore iphone, saying i do not have permission

Email address hacked via iphone. iphone locked home screen displaying my email password! and has been reset. now unable to restore iphone, saying i do not have permission

If you don't know your password, don't know your security questions and don't have a rescue address or don't receive a reset email, you should contact AppleCare who will initially try to assist you with a reset email or if unsuccessful will pass you to the security team to reset your security questions for you.
If you are in a region that doesn't have international telephone support try contacting Apple through iTunes Store Support.

Unable to restore iPhone. error code 21

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