Cut and paste this URL to share the unmodified register and value:
https://regviz.com/r/Silicon Labs/Series1/EFM32PG12B/EFM32PG12B500F1024IL125/GPIO/PG_PINLOCKN#0x0
Port Unlocked Pins Register
Unlocked Pins
https://github.com/cmsis-svd/cmsis-svd-data