Couldn't resist testing for IMEI loss....
I installed TWRP recovery via Goo app, backed up CM10 (installed via CWM) with TWRP, used TWRP to flash CWM recovery, restored a CWM stock deodexed nandroid, reinstalled TWRP to make a nandroid of the stock ROM, restored the stock via TWRP to ensure it worked and then restored CM10, which is what I've been running since 7/20. I tested for IMEI loss along the way and (so far) it's still there.
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d.cortez || SGS 4 || SGN 3 || Nexus 7 (LTE)
"My life has no purpose, no direction, no aim, no meaning, and yet I'm Happy. I can't figure it out. What am I doing right?" --Snoopy