Cut and paste this URL to share the unmodified register and value:
https://regviz.com/r/STMicroelectronics/STM32H7x5_CM7/SYSCFG/UR8#0x0
SYSCFG user register 8
Mass erase protected area disabled for bank 2
Mass erase secured area disabled for bank 2
https://github.com/cmsis-svd/cmsis-svd-data