afterburner32

ok...first of all...i have an axim x50v that has WM5 on it...i want to downgrade using the SD card methid, however, i only seem to have the .IMG file and not the .crc that is required....does anyone know how i can make the .IMG file into the .crc file?..the sticky thead does not seem to have any info on how thats done...maybe i just missed it...i dunno...but please redirect me if you know where i can find this information...thanks