Sorry to raise from the dead, but everything is possible.
There almost 'has' to be a way to flash it with a new rom. I work with IT and know its possible to flash almost anything with a little determination.
Only question I have is: is it something an ECU tuning place could do - but its not really affordable/no one here knows how? - or is it more that as Micras are not commonly tuned & very few of them have a motronic ecu anyway nobodys really bothered finding out how its done?
not really as that only has the nissan part numbers rather then the bosch ones. i sent the guy on ebay a message just waiting for his reply. useful page though James for other stuff