Cut and paste this URL to share the unmodified register and value:
https://regviz.com/r/Silicon Labs/Series1/EFR32FG1P/EFR32FG1P132F128GM48/RTCC/RET2_REG#0x0
Retention Register
General Purpose Retention Register
https://github.com/cmsis-svd/cmsis-svd-data