hi there..
i have an iphone 3gs 16gb.
its original firm ware is os version 3.1
yesterday i tried to update it to os version 4.1.
Then it says iphone could not be restored. An unknown error occured (29)


How to solve this?
Is this called a dead I-Phone ?

iPhone Generation :
Unlocked? (or Part Number): I'm sorry. i just get this set from a friend. bought it as a 2nd hand set. and very very unfamiliar with iphone
Current Firmware : 3.1xx
Current network: Previosly DIGI
iTunes Version : 10
PC/MAC : PC
Jailbreaking software : Never Jailbreak before
Problem Encountered : Could not restrore firmware error code 29. and now my phone when plug in, the itune doesn't even show any imei, and current firmware.. all is "NA"
Steps Taken So Far : Tried restore multiple times on 2 computers.
Screenshot of Problem(if applicable) :
Other Information/Remarks :