Sorry, should have clarified. It's the ID of the flash content. Again, not all e2p's list it, and it's re-written when you change the flash anyway. Do a bit of searching and you'll find my .kp map pack for the ME7 e2p.
So, if I upload another flash file the car might not start due to different ID of flash content. Am I right?
Why I'm asking about this: I have ECU from AWT engine with 4B0906018DJ and eeprom with not nulled "software ID". I've uploaded file 4B0906018CH into the ECU and a car didn't start. After that I uploaded eeprom from my HN ECU with nulled "software ID" and the car started. It interested me and I decided to find out with this - why.