Attention to calculate correctly, the checksum HAS ALWAYS NEED to have a original file on RAM1 and the modified file on RAM2. This means that for the first modify you don't have any problems because you have started from original, but if you want modify a already modified file you have to ALWAYS load on ram1 the original file and on ram 2 the file to modify.

WARNING: After using the eprom emulator it MUST to be read the 8 pin serial eeprom of key code for do not lock the ecu.

Remember that if you don't execute this operation you can damage the Ecu forever.