During experimenting the Thingy:91 lost its USB-DFU bootloader, how to get it back?

[Gwen Stouthuysen]

I got a Thingy:91 back from a student who managed to kill the USB-DFU bootloader.

When connecting a USB cable the host doesn't recognize anything connected.

I tried to program the thingy91_nrf52_usb_uart_bridge_2020-10-30_5522ca2b.hex file to the nRF52840 MCU and this brought a difference: now W10 sees something on the other side of the USB cable but still no recognition that helps me.

Any advice on how to solve this?

[Didrik Rokhaug]

Gwen Stouthuysen said:

now the ttyACM sockets come up and the Thingy:91 is installed in W10. (two interfaces, I suppose one for each processor)

 Actually, both are for the nRF9160. One for UART0 (the default log output), and one for UART1 (the default for modem traces).