Quote Originally Posted by Rogue7 View Post
I also didn't back up the GDFS. Could that be the problem?
What does GDFS stand for?
GDFS:This is the phones "stash", where all settings and calibration data is stored (this also goes for the firmwares IMEI-resource as well as the SIMlocks). Similar to other brands use of NVRAM (Non-Viotile Random Access Memory).

Nice day