I have a 2002 New Beetle 1.8T (ME7.5 06A906032A / Bosch 0261206507). Original ECU is bad - gives crank sensor code. Verified sensor and wiring are good. I have a matching donor ECU - it does not throw the same code, but of course there is the IMMO issue.

As I understand it I need to use channel 50 adaptation to adapt the ECU to the cluster. I have both original and donor cluster SKCs (05108 and 01056). KW1281Test extracted both from the clusters. I tried my old VAG-COM 409.1 and the "Login" for the donor ECU module does not accept the SKC from the donor cluster. The cluster does accept it. Am I correct to assume that the donor ECU SKC doesn't match the cluster? Or is that not relevant?

Anyway, what is my next step?

Thanks grayjay.

I was not able to get it to read the EEPROM in boot mode (if I even was able to get it in to boot mode?) with any of my cables.

I bought a CH341a, did the 3.3v mod, and attempted that route. I was able to read both EEPROMs.

The donor ECU one from the junkyard is weird with 65535 SKC, XXXX* vins.

I backed both up and tried flashing the donor ECU with original ECU's bin. All appears to be well, but when trying it in the car, I still get the blinking IMMO light.

Back on the bench, reading the chip again CH341a, it has reverted to the weird 65535/XXXX state.

Any thoughts?

The IMMO2 bit got me thinking so I went and grabbed the lids - the original is a GA rev and the donor is an A rev - I'm assuming that's the issue. I went back to the yard and it turns out that the donor was a 2000 and not a 2002 like it was catalogged as. I've ordered another GA.