iPhone Not Booting, Error 21 When Restoring, Not A Battery Problem
I have bought an iPhone 3GS logic board off eBay and have tried to restore it to the latest firmware, 6.0.1, and receives error 21. The iPhone is stuck in DFU mode and I have tried to restore to multiple other software versions apart from 6.0.1. It sometimes shows a white screen.
The rest of the iPhone is fully functional as I have replaced the logic board with a working one and the iPhone is absolutely fine, so I'm pretty certain it is not a problem with the battery.
I have tried many things including redsn0w and others but nothing seems to work. On the latest version of redsn0w, 0.9.13b3, there is an option to restore the iPhone, which I have tried to use (yes I have the SHSH blobs for it) and I can get it to the Apple logo and the restore bar, but the process does not continue.
Please help if you have any suggestions. Thanks in advance.