I managed to open decrypted user data with hxd and it looks like this;
"stunt_mode":{"stunt_mode_urban":{"stunt_mode_urban2":{"Record":0,"Played":false,"Rank":0},"stunt_mode_urban1":{"Record":15221,"Played":true,"Rank":3},"Record":12670,"stunt_mode_urban4":{"Record":0,"Played":false,"Rank":0},"ActiveRace":3,...................and goes on for every race and stunts.
I tried to change Record":0,"Played":false,"Rank":0 hex values to Record":15221,"Played":true,"Rank":3 but i still got data corrupted error.What am i doing wrong?