I have a Virgin Mobile S3 and am currently running CM12 beta lollipop rom, all is well, love it, but recently my phone inexplicably deactivated, I had no GPS and when I tried to place a call it told me to activate the phone, something that can only be done with a stock VM or Sprint rom, seriously, you can't even reactivate it if you call customer service unless you have the stock rom installed. So I have the Kit-Kat L710PU-ND8 Sprint stock rom which I flashed with Odin and while I was reactivating the phone, Samsung apparently upgraded it to L710PU-NJ2, which is bad I believe as now I can not downgrade NJ2 to ND8, is this correct? Any way to re-flash the ND8 stock rom if I need to reactivate again in the future?