Not strictly true. NefMoto does trigger a write to E2 during a flash. A simple ID string if I remember correctly. I'll post Tony's description if I can find the thread.

are you sure your grounding the right pin on the flash?

Also you need to ground it before turning on the power to the ECU, and then release it shortly after.

I don't recall sorry.

you sure your GND source is good?  when in doubt go right from the battery.

in boot mode the cel doesn't appear. You are doing something wrong my friend. First remove the fuse that galletto sugests. I think is for the instruments. Then to be sure remove the big plug from ecu and leave the other one the smaller . This is the one needed for the boot mode-bench flash. Then locate the f800 chip. And DO NOT GROUND to battery but connect these pins as shown in the picture. That worked for me very well good luck.

Try to remove the "big" plug from the ecu it is not needed for boot mode. You only need +12V, ground, +12V ignition, and K-line. All of them are in the smaller plug of the ecu. Also have in mind that you must ground the ecu firstly with ignition off keep it grounded and then turn on ignition and keep it for 2 seconds more. The remove the "bridge" between the pins. I didn't have a proper cable and used a scrwedriver to do the connection  . Maybe your galletto isn't working. I told you everything i could. Good luck.

DO NOT mess with eeprom. Try nefmoto to flash again an original file NOT yours to be sure. It will clear the bad checksum problem. Also try to leave the ignition on for 30 minutes so that the ecu can "run" the new program. Also try to find proper edditing tools so that you won't have checksum problems all the time. I change programs to my car more offten that i am changing T-shirts without any problems. Dissabling the immo or something else won't help you at all. Regards.