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]

Hi,

 

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.

 What does Windows see?

 From what folder did you take the .hex file?

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

 Do you know how?

Is it the nRF52840 that is the problem, or the nRF9160?

Anyway, the easiest solution, is if you have an external programmer (such as an nRF9160 DK, or an nRF52XXX DK), and then program the nRF52840 and/or the nRF9160 that way.

Best regards,

Didrik

[Gwen Stouthuysen]

I got the FW from the nordic website: https://www.nordicsemi.com/Software-and-tools/Prototyping-platforms/Nordic-Thingy-91/Download#infotabs

Windows simply doesn't recognize the device and resets the connection, he keeps on doing this till you unplug.

How the student managed this I don't know, he told me he deleted something that gave errors in the Windows system.

If you tell me which files should be programmed to which processor in the Thingy:91 I can try this out.

I'm using the nRF9160-DK debug out connector.

What I miss in these files from the nordic website is the bootloader: there was no bootloader anymore on the nRF52840.