Another user has his car immobilised because he gets "no response to any known code" following a flash that reported OK but the car won't start. There was a change to the ROM combined with an upgrade to 1.29 on an old 1.3M cable. The recovery vehicle managed to read an OBD code with an immobiliser fault, but the immobiliser codes were matched in the ROM image. They tried a reprogram with a battery booster on too - still the same. Another user is going to visit him with a different laptop and cable.
I wanted to investigate the change to the ROM on my car, but I find with an old 1.3M cable that I either get no response to any known code, or that it got so far just reading the ROM:
http://john824.fotopic.net/p38025725.html
It is quite cold, battery voltage is 11.5V but my car starts easily and I've successfully flashed before using my newer Universal cable. Unfortunately at present my Universal cable is lent out, and the 1.3M I have is from another user who was having problems with this cable. Initially it worked, now the problem is as above. I don't have a battery charger handy.
Could there be a temperature or voltage issue with the earlier cables?
When I get my Universal cable back I will try again, and make sure I can do 100% successful reads and compares before trying a write to be sure.