totally screwed up...i have a used iphone 4 which was active and jailbroken by its original owner. decided to erase and reset everything and try to jailbreak again without first checking WHICH iOS i was already running! so i went forward blindly and tried to jailbreak with 4.2.1 using every version of redsn0w. now the phones stuck in a dfu/recovery loop. broke it out of the loop with tinyumbrella, but it just goes back into recovery and when its in recovery it doesn't indicate that a sims missing, and it doesnt read capacity, software version, or serial on itunes. is my phone finish?