Solved
STM32H74xxx/75xxx configuration DFU Mode
AN2606 says it must be configured in USB FS configured in forced device mode.
USB FS interrupt vector is enabled and used for USB DFU communications.
Is it also possible in USB_OTG_HS mode?
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Hello @roblahnst and welcome to the community
DFU is available only on USB_OTG_FS for STM32H74x/H75x:
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