VC4-RatOs 2.1 48V 5160T Pro Unable to write tmc spi '...' register GLOBALSCALER

Hi!
I've just finished the wiring on the new V-core-4.
As far as it looks everything works, except the 48V Stepper drivers (5160T Pro):

Whenever I want to move X or Y, then the mentioned error comes up and it goes into shutdown.

What did I do:
  • I tried the same setup with 24V and 2209 which worked fine, I could use both X and Y; Z are always 24V with 2209 and working fine
  • Helge mentioned that it needs to be SPI mode > added jumpers > now I get actual values with DUMP_TMC STEPPER=stepper_x
  • Verified that 48V are correctly attached (multimeter check if its actual 48V and mainboard also lights up the green motor power led)
  • swapped X+Y randomly with Hybrid Y1 / Y2
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