Problem:

I read JC dash from VW golf 7 cluster mcu D70F3426 with Xhorse multi prog, not possible unlock 70f3426, detection is ok but not unlock.

Solution:

Power on the Multi standard adapter to start up the programmer.

You might have this problem:
And also 12V power directly on the adapter, via connector.

Been there, found out the hard way.

Feedback:

Unlock mcu in second as said above.