Question about Apple MC555LL iPhone 3GS 8GB Smartphone-Black ATT

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Iphone 3gs wont restore tells me unknown error (-1) What needs to be done to fix this?

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I had the same problem, basically error -1 is telling you that you need to do soething before you try and restore it. Have you tried installing the latest iTunes and then shutting down your computer, then trying to restore it again?

Posted on Jun 08, 2013

  • Bharat Tomar Jun 17, 2013

    I tried that too still same error checked with apple device needs a repair.

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Posted on Jan 02, 2017

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SOURCE: iphone 3gs wont restore tells me unknown error

go to apple store or do it on itunes

Posted on Nov 21, 2011

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Iphone 3Gs is just lifeless no sound nothing....Itunes recognizes it and says its in recovery mode and it needs to be updated and restored so I press restore and it starts downloading or something for...


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.

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Basically my iphone wont rsetore everytime i want to retore it will come up with an error


Step 1: Find out which generation your iPhone is by looking at this link http://support.apple.com/kb/HT3939
Step 2: Download the correct generation with the most up-to-date number, the higher the number, the more up-to-date it is. Example: A 3GS iPhone, that would be the most up-to-date would be iPhone 3GS (4.2.1/8C148a). The 3GS tells it that it is the iPhone 3GS. The part I have put in bold, is the update number, the higher that number is, the more recent it is.
Step 3: Go into iTunes, with your iPhone plugged in, go to the left side of the screen, scroll down and select your iPod.
Step 4: The right side of your screen should now show the general iPhone information. Scroll down the screen on the right side until you see a button that says "Restore". Hold down the SHIFT KEY on your keyboard and click "Restore" on your screen. This will pop up a menu.
Step 5: From that menu, choose the update you just downloaded and hit OK. Your iPhone will now be restored. After a few minutes, you will be greeted with a welcome screen to re-sync your iPhone.
This is the only method that seems to work.

Feb 21, 2011 | Apple iPod touch

2 Answers

How to fix my iphone 3gs having icons of usb pointing up to the icon of itunes then slide emergency call?


your iphone needs to be synced with itunes or activated with your service provider.

1. open itunes on your computer
2. plug your iphone in to a usb port on your computer
3. follow the instructions on the screen

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For NO apparent reason my iPhone 3GS's backlight has suddenly ceased to work. All other aspects of the phone work perfectly. You can still see all icons on screen but have to tilt it so light reflects the...


If you havent done any of those things, take it in a nd have it repaired. That should be covered under warranty.

If they tell you they wont fix it, check out the followin glink for a low cost Iphone screen repair service

Repair Iphone 3GS Backlight Problem

Dec 01, 2009 | Apple iPhone 3G

1 Answer

My iphone 3gs suddenly turn off and won't turn on


You need a new logic board. Apple should give you a replacement. If you're out warranty, you can try to open it and replace the logic board yourself. You can get the part at iPad Repair and there is a guide that shows you how to open a kindle and install parts at iPad Repair Guide.

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1 Answer

Tried restoring iphone on my itunes account and it said "restore failed" my iphone is totally disabled and I am unsure how to fix this problem


When your restore fails, it usually tells you, Your iphone could not be restored, an unknown error occured(number). Get that number and either post it on here or call 800 my iphone with it.

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1 Answer

Iphone locked on updating and needs restoring but wont complete so unable to use phone, also i cant find my contacts list so i can use the numbers. the display just shows usb plug and an arrow to itunes. i...


It should give you an error number, it says it cannot restore an unknown error occured(number). Call 800-myiphone with that error number to get it fixed.

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