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,

Andrew8691 said:

Thanks Markus - the revision of the non-working one is 1.4.0 2020.23 (the other one is the same but has 2020.22)

 Are you using the same SIM card on both devices?

2021-07-27T09:23:48.848Z DEBUG modem >> AT+CEREG=5
2021-07-27T09:23:48.863Z DEBUG modem << OK
2021-07-27T09:23:48.869Z DEBUG modem >> AT+CEREG?
2021-07-27T09:23:48.889Z DEBUG modem << +CEREG: 5,2
2021-07-27T09:23:48.894Z DEBUG modem << OK

You should normally get more information here than “5,2” only.. which might indicate that there is something wrong with the SIM card.

Regards,

Markus

[Andrew8691]

Thanks Markus, I used the Basis sims that came in the box with the devices. The unit that is causing problems has an aquamarine coloured SIM whilst the working unit has a white SIM. in the pic, the unit on the left is the working one.