Hello,
The immo is on the serial eeprom chip not the AM29f200 chip you are playing around with.
The Chip needs to be the same as the one that came out the number I think it should be is an AMD AM29f200BB ? Plus the information on that file needs to match the ecu and car.
The information on the file from your 06A906018CG 1.8L R4/5VT should be 0261200518 - 1037352127
If this is all ok then the problem culd be down to a naffed solder solder pad. chip fitted wrong way around, shorts on the chip legs, or solder shorting the some of the other chips. You really have to butcher the ecu to kill it.
If you get another ECU you will need to change the immo chip or have the chip patched to work on your car.
The car could have already been remapped, but the power can lost via a boost leak, naff n75 or duff maf.
If you get another ECU you will need to change the immo chip or have the chip patchedto work on your car.
Nick