also u can try with IReb.

so you are saying for him to take his phone apart and remove the battery???

Originally Posted by truehybridx

so you are saying for him to take his phone apart and remove the battery???

yes, if the problem is with hardware issue, can try removing the battery for 1 hour (its hardware reset, its like with a motherboard from a PC, when u remove the batery, u reset the bios and it fix 90% of problems, and it also work on iphone)
Error 25/28 in itunes usually is a problem from battery and u can try fix removing the battery or buying a new battery (i have fixed 2 iphone 3g/3gs removing the battery when apple say its a hardware problem), now about error 21 usually get that error when u are trying restoring the firmware in mode recovery, but if u change to DFU mode (black screen) i think u can restore it without problems, if it not work and u think is a hardware problem u can try with my method (removing the battery for 1 hour).

ops, i didnt saw this. this post is from 2008!!!! OMG :s

If I wanted to test this process, how would I go about erasing/zero'ing NOR flash.