CM5 rpiboot

Morning,

Received my new CM5 module but not having any luck getting it working.

Plug into carrier board [Piunora]
start rpiboot then connect board
nothing happens.

Replace with old CM4 unit and do exactly the same, same board, same cable, and it shows up.
Is it broken?

Did you recompile the most current version of rpiboot?

I hadn’t but have now. Still no luck. Think its to do with the carrier board. It states -

Holding down the USB boot button while attaching the USB-C cable will enable USB boot. This button is connected to both GPIO25 and the nRPI_BOOT signal for USB boot.