Cut and paste this URL to share the unmodified register and value:
https://regviz.com/r/Infineon/XMC1400/SCU_GENERAL/STSTAT#0x0
HWCON=value1
Startup Status Register
HW Configuration
0 (value1): User productive mode (UPM)
1 (value2): ASC BSL
2 (value3): Alternate Boot Mode (ABM)
3 (value4): CAN BSL
https://github.com/cmsis-svd/cmsis-svd-data