More details required. Which R4 clone do you have? Which version of the firmware are you using? What type/brand/size of SD card are you using? How much free space do you have on the SD card? How did you format the SD card? Where did you get the cheat.dat from? etc etc If you want people to help you have to provide as much information as possible.
Oh, and people who say 'pl0x' are cunts.