Existing users, 
How to restore your iPhone without using firmware 1.1.1
Posted 27 September 2007 @ 12pm in Uncategorized
If you have unlocked — for use on a carrier other than AT&T — your iPhone and want to restore it (because of troubleshooting issues or other reasons) while avoiding firmware/software update 1.1.1, which may cause your iPhone to become non-functional, use this method to restore using iPhone firmware 1.0.2 instead:
On a Mac hold down the option button while clicking “Restore,” on a Windows sytem hold down “Shift” while clicking “Restore.” This will bring up a window to select the firmware file you would like to use. (On a Mac, it’s located in ~/Library/iTunes/iPhone Software Updates). The old firmware file is named iPhone1,1_1.0.2_1C28_Restore.ipsw
Note that this will not downgrade your iPhone’s firmware, but will only allow you to restore your iPhone that is running firmware 1.0.2 with the same firmware 1.0.2 revision rather than updating to version 1.1.1, which is the default under iTunes 7.4.x when performing a rstore.
Feedback? info@iphoneatlas.com.
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4 Comments
Posted by cdatt
27 September 2007 @ 1pm
HELP!!!! I did not nothing to my iPhone. I am a plain vanilla user - NOTHING. First I got the Error 1604, than I rebooted the computer - reset the iPhone - and got Error 1604 again. Now I just tried to use the old iPhone Software update (C28) and it says I have an unknown error. I have an IBRICK!!!
Posted by cdatt
27 September 2007 @ 2pm
That was quick. Called iPhone support - they said plug it in to a different USB port. Bingo - that worked. Previously it was plugged into a powered hub and it syncs fine. For the update I had to plug it into the MAC’s USB port on the computer. They said that is the first troubleshooting step for Error 1604.
Posted by msanta1
2 October 2007 @ 9pm
This is basically for restoring an iPhone that have ben unlocked and don’t want to use the 1.1.1 firmware. This will not work on an iPhone that hasn’t been unlocked and was upgraded with firmware 1.1.1.
Posted by waspapi
24 October 2007 @ 4pm
Hi, I can’t use my unlocked iphone with itunes because it want’s me to do a system restore. If I follow the method above, is it gonna get back working fine as it was with no problems? Also, will it lock the iphone again?