Cut and paste this URL to share the unmodified register and value:
https://regviz.com/r/stm32/stm32wb0/STM32WB05/RADIO_REG_REG/VIT_CONF_DIG_ENG#0x0
VIT_CONF_DIG_ENG register
Viterbi enable
spare
https://github.com/modm-io/cmsis-svd-stm32