The procedure can be applied to Kessy including kessy continental 93C86 all keys lost,
Are all id46 chip.
The job is done by xhorse vvdi prog and vvdi2.
Here we take an example of the Porsche Cayenne Kessy ID46 key.
Remove kessy module, read 93C86 eeprom with vvdi prog
Better solder following the wiring diagram
Read also: VVDI Prog Read Touareg, Audi A8, Porsche Kessy 93C86 in circuit
With Xhorse Vvdi2 go under VW immo4 you will see A8 last option (Immo Kessy- Audi A8, VW Touareg, VW Phaeton, Porsche Cayenne, Bentley Continental 93C86) load the eeprom file you will get the CS and the pin.
Get pin. Program virgin key with login pin with vvdi2.
Make a dealer remote and connect the Vvdi2 to the car and learn the key (only if your chip is ID46).
If you try to open to get cs says unknown version. You should desolder and read again. Always de solder it just because the crystal.