Cut and paste this URL to share the unmodified register and value:
https://regviz.com/r/STMicroelectronics/STM32F7x8/NVIC/IPR17#0x0
Interrupt Priority Register
IPR_N0
IPR_N1
IPR_N2
IPR_N3
https://github.com/cmsis-svd/cmsis-svd-data