Cut and paste this URL to share the unmodified register and value:
https://regviz.com/r/stm32/stm32h7/STM32H723/SYSCFG/UR2#0x0
SYSCFG user register 2
BOR_LVL Brownout Reset Threshold Level
Boot Address 0
https://github.com/modm-io/cmsis-svd-stm32