Cut and paste this URL to share the unmodified register and value:
https://regviz.com/r/stm32/stm32h7rs/STM32H7R/DBGMCU/DBGMCU_IDC#0x0
DBGMCU identity code register
Device ID
1157 (B_0x485): STM32H7Rx/Sx
Revision
https://github.com/modm-io/cmsis-svd-stm32