Cut and paste this URL to share the unmodified register and value:
https://regviz.com/r/STMicroelectronics/STM32H7x5_CM7/RCC/D2CFGR#0x0
RCC Domain 2 Clock Configuration Register
D2 domain APB1 prescaler
D2 domain APB2 prescaler
https://github.com/cmsis-svd/cmsis-svd-data