Cut and paste this URL to share the unmodified register and value:
https://regviz.com/r/stm32/stm32wl3/STM32WL33/MR_SUBG/RF_INFO_OUT#0x0
RF_INFO_OUT register
FQCY_BAND_ID[3:0]: Indicates the version of the RFSUBG IP embedded in the device
Indicate the version of the analog RFSUBG IP embedded in the device
https://github.com/modm-io/cmsis-svd-stm32