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you should check out the 4.0.4 file and flash that one, cause from what i have heard it all works when just flashing straight over
i'm holding out for a little longer before jumping on this.
No need to install a 4.0.2 rom, although you probably should flash back to the 4.0.2 radio.
You need to be on 4.0.2 what? Radio? Yes, if you flash the full OTA. But there are 4.0.4 roms now with the radio and bootloader stripped out. Use that if you don't want to flash the radio or you already have the radio flashed previously.You should check this thread out, you do need to be on 4.0.2 or your going to have issues flashing this file.. a custom built ROM of IMM30B this probably isnt an issue but this specific one only updates stock 4.0.2
You need to be on 4.0.2 what? Radio? Yes, if you flash the full OTA. But there are 4.0.4 roms now with the radio and bootloader stripped out. Use that if you don't want to flash the radio or you already have the radio flashed previously.
Why would you update your current rom? Factory reset and install it. (after you nandroid that is) There is absolutely no reason to install a 4.0.2 rom ever again unless perhaps you are returning the phone and want it stock.
No need to install a 4.0.2 rom