I've read on a forum that this ain't possible and gives erratic problems
with the ecu, if you do try.

This BT chip was made to have the bootloader in the back,
instead of in the front.  BB = Bootloader @ front BT = Bootloader in
the back of the flashrom.

Most (if not all 1.8T's are written with the bootloader in the front of the flashrom.

Get yourself a new chip from the net. Google is your friend
They are widely obtainable. In Holland/Belgium it's not that easy, but Germany
and the UK have them in stock @ webshops.

Lately obtained a few of them via www.batronix.com.

Cheers,

PvL

The ECU code is only prepared to handle chips with the BB layout for erasing and flashing.
The code contains a table to recognize chipIds 2257,00D4 (256kB), 22AB,00D6,0038 (512kB)
and 2258 (1MB). If an unknown chipid is found, the ECU will implicitly use the 800BB layout.
If you use an unknown chip/different memory layout, you can't erase/reprogram the chip
via K-line, but normal operation of the ECU will be fine.
If you like soldering on your ECU, you can use a 800BT. Kind of poor mans copy-protection  .