Firmware update for Thingy 91

[Andrew8691]

I cant seem to get the Thingy 91 into boot MCU mode, so that I can update it to the latest firmware.
No matter how many times I try turning the unit off and powering up with the larger press button held down, the firmware programming returns an error complaining that the unit is not in BootMCU mode.

Is there anything else I could try?

[Albrecht Markus Schellenberger]

Hello Andrew,

I’m very sorry to hear that. Let us see if we can help you here.

What Thingy:91 hardware version are you using? This should be visible on the white label located on the PCB.

What image are you trying to flash and what image is flashed to the device currently?

Thanks and regards,

Markus

[Andrew8691]

Thanks Markus, I've tried it with two Thingy 91s . They are PCA20035 (2020:22 and 2020:23) - from the white labels.

I'm not sure how to determine what version the current firmware is - but I see that nrf Cloud complains that the devices are set to FOTA_V1 - if that helps

The version of firmware that I am trying to load into the Thingys is thingy91_fw_2021-06-28_7a076c22

Regards,

Andrew.

[Andrew8691]

I do notice from the programmer tool log that there's a complaint about the serial port:

2021-07-15T14:52:59.958Z VERBOSE Could not fetch serial number for serial port at /dev/tty.debug-console
2021-07-15T14:52:59.959Z VERBOSE Could not fetch serial number for serial port at /dev/tty.wlan-debug
2021-07-15T14:52:59.959Z VERBOSE Could not fetch serial number for serial port at /dev/tty.Bluetooth-Incoming-Port
2021-07-15T14:52:59.959Z VERBOSE Could not fetch serial number for serial port at /dev/tty.AndrewsiPad-WirelessiAP
2021-07-15T15:05:50.321Z INFO Modem DFU starts to write...
2021-07-15T15:05:50.321Z INFO Writing /Users/a.../Downloads/thingy91_fw_2021-06-28_7a076c22/mfw_nrf9160_1.3.0.zip to device
2021-07-15T15:06:02.849Z ERROR MCUboot DFU failed. Please make sure that the device is in MCUboot mode and try again.

2021-07-15T15:05:37.262Z INFO Target device closed.

[Andrew8691]

I've since tried the process using a Windows PC and got much further (than with the Mac) but still hit an error.