Friends I tell them what happened to me! I have a galaxy note N7100 2 and started to install a rom amending the efs folder (something you did not know) as a result I change the imei to 0049xxxxx and good after spending almost a week reading forums got a solusion, not if it was luck or me but I managed to put again flashing the rom imei assassin's. When installing did not give a efs backup and install it all, this rom gives you the option to put the kernel that you want and the modem, I am from Venezuela and trying to install the kernel branded the same rom but I chose the 3rd bottom-up modem. All fine, put me back my imei now had the problem of the signal, it sends me ariza and accommodation. Now a question, if I have signal when reviewing my efs folder is corrupt? I want to go back to have that repaired folder because I can not flash another rom and would stay stuck in this rom, having it bad I would present the same principle failures. If anyone knows how to fix that folder I would appreciate very gusto.Y if anyone has my problem and has the same model you have, this mas say I'll help you with pleasure.