Question about Apple iPhone 3GS Black (16 GB)
This iphone repair can be tricky, error 21 is not a good error. I'm sure it is not a software issue actually it is a harware issue. you can try following and you should be able to fix it. try replacing charging dock on the iphone and then try restoring it. your dock connector is not working properly, or try cleaning it and then try again. tech from
iphone repair mississauga
Posted on Jan 31, 2013
Error 21 is most commonly encountered if you backed up the phone with jailbroken software and then try to restore the jailbroken software. If that's what you're trying to do, I would advise against it. Try to restore from a non-jailbroken image instead.
If that's not what you're doing, there's some other reason that your restoring image has been corrupted, and I'd recommend restoring from another computer, but that would sadly mean starting over from scratch with all your saved data.
Posted on Mar 28, 2011
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Posted on Jan 02, 2017
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Oct 08, 2014 | Apple iPhone 3GS Black (16 GB)
You may encounter the following symptoms while updating or restoring your iPhone or iPod touch:
If this occurs, you can place the device into recovery mode and attempt to restore the device again. If iTunes displayed an alert with an error code, see this article before attempting the steps outlined here.
Note: In certain situations, an iPhone or iPod touch will automatically go into recovery mode after an update or restore issue. If your device is already in recovery mode, you can attempt to restore using iTunes.
Use the following steps to place your device into recovery mode. If the device is already in recovery mode, you can proceed immediately to step 6.
If you don't see the "Connect to iTunes" screen, try these steps again. If you see the "Connect to iTunes" screen but the device does not appear in iTunes, see this article and its related links.
When using recovery mode, you can only restore the device. All user content on the device will be erased, but if you had previously synced with iTunes on this computer, you can restore from a previous backup. See this article for more information
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