ColorMFA

Hello, i currently having a colormfa for audi a4 8E laying around which i want to use in a golf mk4.
Problem is that the 8E didnt have the inputs for mfa handle.
Due this setup i cant open bootloader to reflash to golf 4.
Me was told to ground key 1 and then add the power to the 12v pin but nothing happens.
Anyone has another option?

Greetings.

Me was told to ground key 1 and then add the power to the 12v pin but nothing happens.

For 8E bootloader need ground key2 before apply power.