i just root my s2 international following the guide by galaxys2root.com and they also uses odin to install one of the rom manager.. but its 188.8.131.52.. then i downloaded rom manager from the market and opened it and flash the clockworkmod recovery.. now when i press on the backup from rom manager.. i got an error message saying -- Installing package... Finding update package... Opening update package... Verifying update package... E:failed to verify whole-file signature E:signature verification failed Installation aborted. what is the problem here? does that means i cant backup and update the cwm as well? im stuck here now.. i dont dare to do any custom roms flash as i dont have the stock rom backup.. can anyone help me please!