Many thanks! I did figure out how to use the eepromtool and turn the immo off and correct the checksum at the same time. (Actually I don't know how the checksum could be wrong and I thinking this may have something to do with the immo having become activated on my own car with my own keys..).
Now I'm facing the problem of that I can't read the 95040 chip anymore after attempting to ground pin 24...
Why isn't there anywhere any info on where to ground pin 24?!
I used Ecupinout figure and made a wire from from blue pin 1 ground on the connector to the pin 24 (second pin from bottom left, opposite the circle on the chip). Turned ignition on (+ using an extra battery supply), waited 20 secs, took off the ground, tried to write to the chip with the latest tool (v.1.31):
c:\me7_95040 --bootmode -w -p 1 95040off.bin
Except... it didn't doesn't work. Repeated the steps. Still no boot mode and no connection.
Now I can't even read the freakin chip anymore.