BYD Atto 3 battery contactors controle with stark CMR

[bartremes]

Hi,

Today I went to a car wrecker that have an BYD Atto 3 battery.
When nothing was connected the external volmeter on the HV gave 0V
When I connect the stark CMR The voltage meter on the HV gave 416V !!

I could read out all the battery details like "more battery info" and "cellmonitor"

But when I Click "open contactors" the voltage meter was still giving 416V and I do not hear a clicking sound of contactors that open or close.

I also clicked "unlock crashend BMS" but no difference.

What do I do wrong, or is it not possible to controle the contactors through CAN with a BYD Atto 3 battery?

here some pictures of my setup: