Xhorse VVDI Prog failed to write Volvo XC90 CEM with Renesas MCU M30855FW, all dump is FF FF. You can clone this CEM with Lonsdor K518ISE Kprog programmer.
The function requires an extra 12V power supply.
Go to Adapter- MCU- Renesas- R32C/M16C- Write Flash menu
Choose Renesas MCU M30855FW
Select the original Flash bin file.
Make sure the connection between Kprog-2 and CEM module is correct
Write and verify data
Write flash data finished.
Lonsdor K518 Latest Volvo CEM Reading & Key Programming Guide