STM32WB55 DFU problem (can't detect by laptop) !!!!

[SFall.1]

I designed a custom board with STM32WB55 with a USB connection to update the BLE stack in DFU mode.

When I connected the board to my laptop's USB port, it appeared in the device manager and was detected as a USB device, however since yesterday when I was trying to update the BLE stack on STM32WB55, all of the sudden, my laptop can't detect the board anymore.

I can program the board with the ST-link programmer and MCU is functioning, but I can't use DFU mode.

What would be the problem? Why the MCU is not detected by the laptop?

Would it be possible that I remove DUF bootloader by mistake?

[Remy ISSALYS]

Hello,

In order to connect your board using DFU mode, the option byte nSWBOOT0 should be checked and BOOT0 pin should be HIGH.

Best Regards