Default asphalt 8 1.2.1b

guyz can any 1 help me.....2 play asphalt 8 1.2.1b on ma galaxy grand...am on probam rom....my problem is when i run normal unmodded apk it just says 2 buy license....and when i wid play modded apk of same version w cant play multiplayer...any solution to play with normal apk ?????plz....help me