I had a problem with my iPhone 2g , firmware 2.2.1 who was lock automatically , so I decided to restore to the original settings via iTunes 8.0.2 , and my MacBook 10.5.7 , and then i am unable to activate the DFU mode with pwnage 2.2.5 , but this is normal since this iPhone has been pwned before , so I connect to iTunes in recovery mode with my t-mobile sim card inserted , and try t restore by clicking "option" key and restore with my custom_restore ispw folder , but every time I have the same error message saying "unknown error 21" , can you help me ???