IMEI issue

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http://forum.xda-developers.com – Hey guys, Did some searching but couldnt find anything about my specific problem. Recently installed a couple new ROMs and when I was backing up and restoring between them (with CWM) I somehow lost my IMEI and it was showing as B000000000. I made the mistake (you learn the hard way I guess!) of not backing up my IMEI beforehand, but my first question is how could it get lost by performing CWM backup/restores? Improper data/cache wiping? I came across the IMEI repair writeup using QPST to manually write a new NV and that seemed to work. However when I rebooted, the IMEI was one numb (HowTos)