Hi all!
I just installed CM12.1 on my LG LS660 (Tribute), and ran into the problem that others had where the display and touchpanel didn't work correctly. So I moved it back to 12.0. That seems to be working mostly alright (except that I can't turn the display off, without it turning back on a second later :-S )... however, it seems that I lost my phone's serial number in the process.
When I try to make a call (using RingPlus), it errors out .. when I compared my MEID/IMEI/etc on the About screen to what RingPlus has on their end, the numbers are quite different.
I restored to stock, and the problem seems to persist. How can I fix? I really didn't think that the ESN info would be in a place that was overwriteable!