I think Bruno's site has it.

Originally Posted by
TheGeak
So as the parting out continues I am faced with a dilema. How do I safely remove the ECU? Can anyone direct me to a write up of how to do this or walk me through it? I've heard its simple, but I don't want to break/damage anything. Thanks!
Jason
For replacing the chip, there's a set of instruction on removing the ECU. Very simple - just undo the black cover (Phillips head screws IIRC), unbolt the ECU box from the carrier rails, unclip the connector (big SCSI looking thing) and you're done. Rumour has it you don't have to disconnect the battery but I did for mine anyway just to be sure there was no chance of a hot wire doing anything.
HTH
Robin
Robin
72 Chevy K10
01 E39 M5