Nordic Thingy:91 MCUBoot not working

[saremshal]

Hello,

I had recently gotten a Nordic Thingy: 91 and I was following this tutorial to help me get started.

https://www.youtube.com/watch?v=xQ7hDzRULJQ

When it came to updating the firmware, I was running into some issues with MCUBoot.

I had done the following process:

1) I turned off my Nordic Thingy:91

2) I plugged my Nordic Thingy:91 into my computer with a USB

3) I opened the Programmer in the Mac OS nRF Connect application

4) I made sure MCUBoot was enabled in the programmer

5) I held down SW3 (the big black button) and while holding it down, I flipped the switch on the Nordic Thingy:91 to ON

6) I then went to Select Device and selected the Nordic Thingy:91 in the programmer,

7) From there I clicked Update Modem, selected the firmware, and clicked write

After doing this, I get the following result:

For context as well: When I hold down the button and turn on the device, I notice the LED does not turn off. I am assuming that means the device had entered Serial Recovery Mode.

Do you know what I may be doing wrong or why this is not working?

[saremshal]

I tried using a .hex file called thingy91_nbiot_dfu_2020-09-23_b6ad40d0.hex

When updating the nRF52840, it seems to let me flash this through the command line. The file I used for this was thingy91_nrf52_usb_uart_bridge_dfu_2020-09-23_b6ad40d0.hex 

(It also lets me flash with nrf Connect Programmer but halfway through the flashing, the Programmer App screen goes white and doesn't let me view any of the GUIs for some reason) 

[Didrik Rokhaug]

When using mcumgr you must use the .bin files, not the .hex files.

After updating the 52, have you been able to update the 91?

You might also want to try the connectivity_bridge instead of the usb_uart_bridge on the 52.

Finally, there is a newer version of the firmware available on our website. Using the newer firmware might solve the problem.

[saremshal]

Hi, I was trying to test out these suggestions you recommended, but for some reason, my device is no longer showing up on my computer. I was able to verify this by looking at the devices that appear when I do "ls /dev/tty.*" in the command line. So I am not able to connect to it due to this. 

(I also tried this on another mac computer and it did not seem to find the device either)

Did perhaps flashing the .hex with the nRF52 mode cause this? 

[Didrik Rokhaug]

Hi, and sorry for the late response.

I tried to use mcumgr with a .hex file, but it did not let me, always returning a "file not found" error.

I will try again on Monday from a Linux VM to see if I get a different result then. I'll also ask our developers if they know what is wrong.

Does the device appear if you put it in DFU mode?

And just to be sure, when you put the nRF52 in DFU mode, are you using the big or the small button?

[saremshal]

Hi, the device does not appear if I put it into DFU mode and when using nRF91 I use the big black button, but for nRF52 I use the small white button.