bricked Thingy91 unable to put DFU mode nrf9160

Hello, 

What version of the Thingy:91 are you using? This is visible on the sticker inside located on the PCB.

I've flashed the nrf51 bridge firmware using MCUboot

What firmware are you referring to? How did you program this? 

However, when i try to put in DFU mode the nrf9160 nothing happens and no com port is detected in MCUboot.

How are you doing this? 

Please provide more information for us to reproduce this issue.

Thanks.

Kind regards,
Øyvind

Hi Øyvind,

my thingy91 is ver. 1.6.0 

the nrf5xxx i programmed it in MCUboot , with sw select on nrf52 and DFU mode with sw 4 The file i use was the file thingy91_nrf52_connectivity_bridge_2022-02-17_ec486dab.hex

for the nRF91xx i switched sw select to nrf91xxx and try DFU mode with sw 3 and powering. However no COM port is detected , so no download possible.

Hello, thanks for providing this information. 

mtpsilva said:

The file i use was the file thingy91_nrf52_connectivity_bridge_2022-02-17_ec486dab.hex

I assume that you are using img_fota_dfu_hex\thingy91_nrf52_connectivity_bridge_2022-02-17_ec486dab.hex

This should be enough to put Thingy:91 nRF9160 into MCUBoot mode, holding SW3 while powering the device on. The device will show in Programmer app as Nordic Thingy:91. And you should now be able to progra e.g. img_fota_dfu_hex\thingy91_asset_tracker_v2_ltem_2022-02-17_ec486dab.hex

Kind regards,
Øyvind

You are correct.
TIs this file i used "img_fota_dfu_hex\thingy91_nrf52_connectivity_bridge_2022-02-17_ec486dab.hex"

However, to program using SW3 the thingy91 does not get detected . No COM port for me to connect and download the firmware.

I've been trying to reproduce, but I'm not able. Does it not show as Thingy:91 in the programmer app?