I have a friend who managed to screw up their iPhone 4. I think they may have managed to flash it with a 3GS ipsw bundle. I've tried just about everything to get it working again. According to her it came on iOS 6.1 and she was able to use it with WiFi to download apps and such (it wasn't jailbroken). She then tried to jailbreak it, and it's never been the same. It has no IMEI, bluetooth, or WiFi now despite all my trying. She said she tried to jailbreak it the same way she did with her 3GS, but with a newer version of redsn0w. When I asked if she downloaded the proper IPSW - she didn't know, so I'm guessing not. I've managed to get it on iOS 6.1.2 with a tethered jailbreak using redsn0w 9.15b3 but all comm services are gone. I noticed that it had SHSH blobs for 4.3.3 thru 4.3.5 and 6.1.2. Also, the latest Tiny Umbrella (6.1.2) reports the phone model as: "MC608LL/A - INVALID" which seems odd to me. From redsn0w's identify: Code: ActiveWirelessTechnology: kCTWirelessTechnologyUnknown BasebandMasterKeyHash: UNAVAILABLE BasebandStatus: BBNotReady BasebandThumbprint: UNAVAILABLE BluetoothAddress: 00:00:00:00:00:00 FirmwareVersion: iBoot-1537.9.55 ProductType: iPhone3,1 ProductVersion: 6.1.2 WiFiAddress: 00:00:00:00:00:00 Would this be indicative of a shot baseband that can't be fixed via software? If that's the case, is replacing the BB chip a big deal? And where would I find the chip for purchase? I found this article that has a detailed procedure for the 4S - I assume the 4 is pretty much the same? And is the baseband chip the only part that would need replaced? http://www.ehow.com/how_12227403_replace-iphone-baseband-chip.html Any help would be greatly appreciated.