New feedback: Land rover Discovery 3 all keys lost work perfect with xhorse vvdi2 and vvdi prog.
Programmed new 7936 over old keys then add remote keys obd.
Make sure to use a blank original pcf7936 and write new dump back.
The BCM box is behind glove box.
You will need to remove component and put 10k resister across the two wires (blue and red)
In vvdi prog, select go to immo, rover, CEM, disco 3
Then upload dump to make key with vvdi2.
Check detail instructions here:
VVDI Prog+ VVDI2 Adds Transponder Key to Land Rover Discovery 3 BCM
You can also make key via OBD using JLR SDD or OBD programmer (i.e SKP1000).