Can't put Thingy91 into recovery mode / USB not recognized

RE: Can't put Thingy91 into recovery mode / USB not recognized

bmo — Tue, 10 Nov 2020 11:48:23 GMT

For clarification while flashing the hex with the programmer, the screen goes blank at 100% while flashing the nRF52840.

RE: Can't put Thingy91 into recovery mode / USB not recognized

nikolozka — Mon, 09 Nov 2020 16:45:09 GMT

In my case i've successfully flashed it with the desktop programmer over usb but with .hex version of application.

RE: Can't put Thingy91 into recovery mode / USB not recognized

bmo — Mon, 09 Nov 2020 12:38:14 GMT

Was able to resolve this by flashing nrf52 with mcumgr. nrf91 is now back up.

mcumgr --conntype=serial --connstring=/dev/ttyACM0 image upload thingy91_nrf52_connectivity_bridge_dfu_2020-09-23_b6ad40d0.bin

Hello,

I think I'm facing this exact issue. Glad to see you successfully got the nrf91 working again.
Device is not detected over USB even with SW3. nRF52840 recovery is accessible with SW4.

Does nrf desktop programmer work to flash nRF52840?
I've been trying this with no luck.

I hope I wouldn't need an SWD Programmer to flash the RF52840.

RE: Can't put Thingy91 into recovery mode / USB not recognized

bmo — Mon, 09 Nov 2020 12:25:22 GMT

Hello,

I think I'm facing this exact issue. Glad to see you successfully got the nrf91 working again.
Device is not detected over USB even with SW3. nRF52840 recovery is accessible with SW4.

Does nrf desktop programmer work to flash nRF52840?
I've been trying this with no luck.

I hope I wouldn't need an SWD Programmer to flash the RF52840.

RE: Can't put Thingy91 into recovery mode / USB not recognized

Didrik Rokhaug — Fri, 06 Nov 2020 16:53:19 GMT

Pretty much, yes.

The nRF9160 does not support USB, so the Thingy:91 uses the nRF52840 to provide USB support. Therefore, if you program the nRF52840 with an application that does not support USB, you will not be able to interface with the nRF9160 that way.

However, you will still have access to the debug port of the nRF9160, so if you have an external programmer (such as an nRF9160 or nRF5340 DK), you can still program the nRF9160. In addtition, you can use the debug port to set up an RTT connection, so it is still possible to get logs from the 91.

You might also be able to connect to vairous test points etc, and be able to use that as a way of communicating with the nRF91, but you will have to check the hardware files of the Thingy to see if that is possible.

RE: Can't put Thingy91 into recovery mode / USB not recognized

nikolozka — Fri, 06 Nov 2020 16:27:51 GMT

Do i understand correctly that if nrf52 is flashed with something completely different - Blinking LED application for example - It would be impossible to interface with nrf91?

In other words either usb_uart bridge or the connectivity bridge on nrf52 are a a prerequisite for working with nrf91 on the Thingy?

RE: Can't put Thingy91 into recovery mode / USB not recognized

Didrik Rokhaug — Fri, 06 Nov 2020 16:17:46 GMT

[quote user="nikolozka"]Does one have to have the connectivity bridge running on the nrf52 in order to interface with the thingy?[/quote]

No, the usb_uart bridge application should also work.

But there has been some problems in the past where the computer/nRF Connect for Desktop would not recognize the Thingy, etc. Therefore using a newer application version on the nRF52840 might solve connectivity problems.

RE: Can't put Thingy91 into recovery mode / USB not recognized

nikolozka — Thu, 05 Nov 2020 19:06:46 GMT

Inspired by your answer I flashed the nrf52 with the connectivity bridge. After the reboot I was able to put nr91 into recovery mode again using SW3.

Currently flashing the Modem FW update.

Everything seems to be in working order again.

Does one have to have the connectivity bridge running on the nrf52 in order to interface with the thingy?

I believe the problem appeared when I flashed the nrf91 with a hex file intended for nrf52 though i'm not 100% sure.

The version I have is PCA20035 1.4.0

Perhaps someone will find this thread usefull.

Thanks for the swift reply.

Best,

Nikoloz

RE: Can't put Thingy91 into recovery mode / USB not recognized

Didrik Rokhaug — Thu, 05 Nov 2020 16:31:23 GMT

Hi,

What application is running on the nRF52?

It should still appear as a USB device even if you have something "wrong" on the nRF9160.

Do you know what the last thing you did before it stopped working was?

What application is running on the nRF91?

What version of the Thingy do you have?

Best regards,

Didrik