foreigneRS,

Nick, The ECU upgrade shouldnt fail
This is because, the update goes in to a flash disk type storage system
on the ecu and is saved and validated ONLY then the original software is deleted.
The new ECU software is fully tested on my own car and few others before
it is released.
The upgrade I am sending you has been available for over 5 months
and is pretty much field tested on many cars now anyway !

My first recomendation for all users upgrading is ALWAYS back up your
maps and PC software in another folder to be absolutely safe