Cut and paste this URL to share the unmodified register and value:
https://regviz.com/r/Atmel/AT91SAM9G25/UDPHS/EPTRST#0x0
UDPHS Endpoints Reset Register
Endpoint 0 Reset
Endpoint 1 Reset
Endpoint 2 Reset
Endpoint 3 Reset
Endpoint 4 Reset
Endpoint 5 Reset
Endpoint 6 Reset
https://github.com/cmsis-svd/cmsis-svd-data