error 29 on iphone 3gs

Ive been reading alot of posts on line regarding and error 29 (hardware failure or something similar)although it seems to be only 3gs that does it - thsi may not be the case im going off only what i have read so far - theres been some mention of irecovery being able to make it boot again i just wanted to post that it might also be worth giving "umbrella" a try the "boot out of recovery button has worked wonders for me with similar faults when itunes is finding faults etc.