Cut and paste this URL to share the unmodified register and value:
https://regviz.com/r/stm32/stm32f4/STM32F405/Ethernet_MAC/MACA1HR#0x0
Ethernet MAC address 1 high register
MACA1H
MBC
SA
AE
https://github.com/modm-io/cmsis-svd-stm32