Cut and paste this URL to share the unmodified register and value:
https://regviz.com/r/STMicroelectronics/STM32F107xx/USB_OTG_DEVICE/DOEPTSIZ0#0x0
device OUT endpoint-0 transfer size register
Transfer size
Packet count
SETUP packet count
https://github.com/cmsis-svd/cmsis-svd-data