dmo , Sep 14, 2014 : What I did wrong: Didn't backup EFS obviously (figured it wouldn't be an issue having owned 2 Samsung phones, as long as you're not doing anything crazy) I backed up my 0913 nightly on TWRP and installed an older nightly to try to diagnose a CM bug. When I restored the 0913 nightly (I'm guessing restoring the modem part was the troublemaker), it came back with no IMEI, no connectivity, etc. I checked the root folder of the phone and there's no EFS folder. Am I screwed? I tried to follow this thread on XDA to flash ColorOS, but no dice. The phone boots, but still no IMEI. No EFS folder is rebuilt Also tried what someone suggested with flashing a 33R Rooted ROM including the radio. No go. My Nexus 5 is out on RMA (woohoo), so I have activated the SGS2 for now. Ugh.