Cut and paste this URL to share the unmodified register and value:
https://regviz.com/r/stm32/stm32f1/STM32F100/FLASH/OBR#0x0
Option byte register
Option byte error
Read protection
WDG_SW
nRST_STOP
nRST_STDBY
Data0
Data1
https://github.com/modm-io/cmsis-svd-stm32