sum

Hello. I have a Moto GP1280 UHF Mobile type MDH25RDN9CK8AE, i have software but no codeplug and when i try to read or write to the radio i can not, it displays on the radio screen on power on, "EEPROM CKsum" radio failure Can anyone help me, thanks.

Hey All, I've flashed the other 6 996 units we have, and our 396 with no problems up to the latest version. Following the same methods used to succesfully update the other radios I have one which refuses to cooperate and display a checksum. It simply says SUM=0FF. Tried to google the problem...