Door deadlocking solved!
 

The doors deadlocking on the Z3 has been a problem as with the new doorskin on you simply cannot open the car.
The remote can simply stop working, I have a spare and neither would work. The only way in is to remove the soft top rear window. If you have a sewn-in rear window or a coupe you are simply buggered.
This has happened to me on 4 occasions on 3 different cars, only once with the roof up, I routinely work with the roof down in case this happens.
Even with the roof down it is a pig of a job to get the doors open, hence the tiny modifications to the inside of the door.https://i.postimg.cc/pT6nDvK8/IMG-4792.jpg

THE CURE

Attach a wire to the blue/yellow/red wire from the ZKE A104 module behind the glovebox. The ZKE module has 3 plus, you want the centre purple one.
https://i.postimg.cc/h4X2NPyk/IMG-4790.jpg
Run this new wire to the boot, lock the car using the fob, touch the new wire to the positive battery terminal and the doors will unlock :humble:
Now I would love to claim this stroke of genius as my own work but someone is bound to grass me up so all credit to gookah on the Z3 forum.