Cut and paste this URL to share the unmodified register and value:
https://regviz.com/r/Silicon Labs/Series1/EFR32MG1B/EFR32MG1B132F256GJ43/TIMER1/LOCK#0x0
TIMERLOCKKEY=UNLOCKED
TIMER Configuration Lock Register
Timer Lock Key
0 (UNLOCKED): undefined
1 (LOCKED): undefined
https://github.com/cmsis-svd/cmsis-svd-data