Warning! Missing FMU SD Card

After updating the firmware to 1.12.3 on CUAV V5 Plus I get “Warning! Missing FMU SD Card” at boot.
Resetting all parameters, I still get this at boot.

Tried v1.12.2 with the same outcom. Went back to v1.11.3 and no warning appears.
Anyone else use v5 plus on 1.12.x?

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