Cut and paste this URL to share the unmodified register and value:
https://regviz.com/r/Keil/AT32F415xx_v2/CRM/OTG_EXTCTRL#0x0
OTGFS external ctrl register1
USB divider reset
OTGFS end-point 3 remap enable
https://github.com/cmsis-svd/cmsis-svd-data