Problem with lite on ihas 122b-04b

hello this dvdrw was crossflash to ihas524b works fine but want to back to stock firmware, when i back to stock the front green light never stock blinking i have backups of firmware and eeprom, when i can convert drive eeprom utility says me invalid checksum i attemp to repair with eeprom utility but says me contact to codeguys, i read in other forum codeguys check and repair checksums md5 files or this cut be a hardware problem? thanks

hello friends i download the dosflash32.exe and make a full erase of firm and later write firmware. later eeprom utility says me bootloader incorrect and i put restore eeprom allways talk about ihas122 firm zl0f and works!!! thanks a lot