Dev-Host - SPCUtility.apk - The Ultimate Free File Hosting / File Sharing Service use this to get your 6 digit MSL write it down
open dialer *#22745927 and enable hidden menu
reboot the phone
open dialer and enter ##786# click on reset default
enter your MSL
This will clear your NV items, wipe your device and reboot. when you start it back up it will do a hands free activation just like when you first bought it from the store. i do this on every CDMA device i sell so that the next owner gets a fresh clean phone that doesnt need to be reprogrammed. once you get that reactivated, you can go back to flashing your hearts content out.
please note that these are the dialer codes for stock metropcs rom, these also will not work on aosp based roms as aosp doesnt have the dialer codes built in.