The iPhone could not be restored. an unknown error occurred; The iPhone could not be restored. This device isn’t eligible for the requested build.
So the other day I was trying to restore (er, upgrade) my iPod Touch 4G to firmware 6.1.1 (not, 6.1.2 like iTunes wanted), and yes, I jail-broke it with evasi0n.
There are a lot of tutorials out there for the evasion jailbreak already, so I’ll just link you to one of those; iPhoneHacks Evasi0n Jailbreak.
What I want to do here, after needing a few of these fixes myself, is to post a, quick, and fairly good sized, list of iTunes restoration errors and their fixes, for people trying to restore a specific iOS firmware.
The Errors, And Their Fixes
The iPhone could not be restored. an unknown error occurred (3194) (21) (1013)
This is caused by iTunes not being able to connect to the Apple server. Solutions can be found on, And It’s Fixed!
The iPhone could not be restored. an unknown error occurred (6)
This is a software error. You can bypass it by, instead of putting you iOS device in restore mode, put it in DFU mode. In DFU mode, iTunes is communicated directly with the device’s BIOS.
To put your iOS device into DFU mode, follow the instructions here;
- Plug the device into your computer’s USB
- THEN, power it off
- Hold down POWER and HOME for 10 seconds
- Release POWER but continue pressing HOME for another 15 seconds
If it doesn’t work, just hold the power button until it turns back off and try, try again.
Also, Tinyumbrella, is a great program that it able to get your device into or out of restoration mode (NOT DFU!) at the touch of a button.
The iPhone could not be restored. an unknown error occurred (1601) (1602)
This error is usually caused by a corrupted iTunes installation. The most common ways to fix this are to either re-install iTunes (a pain) or go through a clean up any registry errors (also a pain).
Check out PersonalComputerFixes for more on that.
The iPhone could not be restored. an unknown error occurred (-1)
WARNING: Error code (-1) and (1) are not to be confused, they are two VERY DIFFERENT errors! Avoid buying iDevices with error code (-1) off ebay!
I’m sorry to have to be the bearer of bad news, but unless you like fiddling with the inside of your iOS device, you might be out of luck. A couple users on the gsmhosting forum have determined that this is a hardware problem with the iDevice itself. They’ve found a fix for it, but it ain’t pretty. I’ll quote them here;
jegerjon 01-07-2013, 04:13
Hi. Last week I had two 4s with error -1 on my table. Solutions were:
1) Cleaned corrosion around amplifier chips (I think BATT_VCC_FET line was partly short)
2) U18_RF were bad, so I took this from a scrap board. It is an AND gate, so I believe you should be able to jump this (feeding BB_HSIC_RDY voltage), I would not recommend it though, get a replacement part it’s not a hard IC to solder.
Also you should inspect capacitors around U4. Hope this helps.
Wites OM Tesla 01-07-2013, 14:45
Error -1 Modem Firmware did not got updated,if phone dropped reball BB CPU,BB NAND and PMIC.
If phone water damaged check voltages and 2 coils near BB CPU there was an solution in (tested solutions thread) just search.
If you understood all of that, then I wish you well in your repair endeavor.
The iPhone could not be restored. an unknown error occurred (1)
This is more of a software error that usually implies there was a problem with the firmware or the downgrade process. The iPhone Wiki, has some suggestions for you to check out, hopefully one of those will work out for you.