well to put phone in DFU mode(restore mode) having the phone off. hold sleep/power button and the home button together. the phone will turn on and once the screen goes blank let go of sleep/power button while still holding home button then just connect phone to PC/Mac and itunes will recognize phone in restore mode(DFU mode). Dont let go of home button until itunes shows it recognize it. then you can shift+restore and point to ur firmware file. if you restore again to 1.1.2 then it wont work. restoring will erase Oktoprep. thats why you need to upgrade to 1.1.2 and not restore.
I made the mistake to put DFU mode when upgrading to 1.1.2 on my guide. i fix it on my post of instructions.
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