Cut and paste this URL to share the unmodified register and value:
https://regviz.com/r/Silicon Labs/EFR32FG23B010F512IM40/MODEM_NS/BCRDEMOD4FSK0#0x0
THD4GFSK
CODE4GFSK
PHCOMPBYP
Enable BCR demod 4GFSK
https://github.com/cmsis-svd/cmsis-svd-data