Only works when your device isnt in deep sleep
To install custom roms on O4x:
1. upgrade to jb
3. unlock bootloader
4. flash custom recovery (cwm)
5. flash roms
6. if you encounter any issues, search, they've been answered already.
Got issues with RIL/IMEI/BASEBAND on custom 4.2, 4.3 or 4.4 ROMs on p880? Click me for possible solution!