Here is a review of XPROG3 adapter:
Xprog3 launch working smoothly with e39 e83 and e67.
Take a look at the process.
Connection requires a power stabilizer.
GIII MCU Adapter simplify the connection.
*MCU Adapter is not a must for ECU clone
Read/ Write Eeprom and Flash via IMMO PROG function
Review from Javier Mijangos.