Cut and paste this URL to share the unmodified register and value:
https://regviz.com/r/Silicon Labs/Series1/EFR32BG1B/EFR32BG1B132F128GJ43/EMU/TESTLOCK#0x0
LOCKKEY=UNLOCKED
Test Lock Register
Configuration Lock Key
0 (UNLOCKED): undefined
1 (LOCKED): undefined
https://github.com/cmsis-svd/cmsis-svd-data