Cut and paste this URL to share the unmodified register and value:
https://regviz.com/r/stm32/stm32wb0/STM32WB05/FLASH_CTRL/CONFIG#0x0
CONFIG register
CPU access routing (it supersedes PREMAP configuration):
Burst write Control:
Add latency to flash read opeations:
https://github.com/modm-io/cmsis-svd-stm32