iREB : Fix error 16xx and 21 during restore iTunes Mac and Windows

iREB : Fix "16xx" and "21" error during a restore in iTunes | Mac and Windows

22 September 2009 by Vinay 8 Comments

iREB a small handy utility for Windows and Mac that can solve the mistakes “16xx” and “21″ from iTunes that are displayed after a reset or a firmware downgrade. iREB is developed by iH8sn0w, and today he released a new update for iREB. The application is only compatible with EDGE iPhone, iPhone 3G and iPod Touch 1G and can be downloaded from here. The tool is available for both Windows and Mac operating system, we advised you to save this program on a secure place on your hard drive because it’s a one of it’s kind utility.

When you will be presented such an error will not have to do is start and follow the instructions on the screen. I recommend you download it and keep it somewhere in your computer .. can come in useful

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8 Comments »

Chuong said:

My Mac OS X does not come with libUSB; how can I install that thing into my mac? I googled it and I didnt find much help in installing libUSB. Any help?

Thank you,

# 23 September 2009 at 8:30 am

iPhonemod said:

When i try to restore iphone firmware from 3.1 to 3.0 and 3.0.1 to 3.0 by using itune
i never got “An unknow error…” but i always got “The iPhone “XXX” could not be restored. This device isn’t eligible for the requested build. ”

what should i do, i use itune 9.0 on mac and windows and try to itune 8.2 the result is same

thank in advance

# 23 September 2009 at 1:01 pm

Maverick said:

@iPhonemod

That’s because you have a 3G S. When you try to restore to a lower version of firmware iTunes/Apple will not sign the firmware except for the latest firmware, which as of this writing is 3.1. The reason for it is the extra layer of security the iPhone 3G S has compared to the 3G.

# 25 September 2009 at 8:01 am

RM.Harry said:

it does not working

# 25 September 2009 at 2:31 pm

Jimbo said:

I have Iphone 3G and tried to update itunes and OS tonight. Itunes updated successfully to 9.0 but when I was upgrading phone it went through everything and as it was updating it froze whle updating software. I tried to restore and now it is freezing when it gets to restoring software. My phone is useless at this point. It won’t do anytihng but show me a pic of a usb cable and the itunes logo. PLEASE HELP…

# 27 September 2009 at 10:21 am

bilal said:

dear brothes

i have facing the problem while restoring my iphone 3GS 32GB how can i fix eligible error while restoring

when i trying to restore 3.1 to 3.1.2 then itunes show error (the iphone is not eligible for restore error)

how can i fix it plz help me via email

my email is bilal_461 hotmail .com

# 3 March 2010 at 6:56 pm

Adub said:

Open up snowbreeze and follox instructions after that open up IREB and click on your device wait a few seconds and this will work I had a hard time doing it without going through snowbreeze

# 30 March 2010 at 2:48 am