Attempts to revert nRF52840 dongle to production bootloader fail

[Chris Pearson]

I'm attempting to revert an nRF52840 dongle to the production bootloader. This dongle has a SWD connector soldered on for use with J-Link, and I have no difficulties flashing my own software onto it.

The problem is when trying to revert it to the production bootloader using the documentation at this link. I've downloaded the hex file, extracted graviton_bootloader_mbr_v1.0.1-[nRF5_SDK_15.0.1-1.alpha_f76d012].hex, and flashed it to the dongle. Once reset, the red LED pulses as expected.

However, when I connect the nRF Connect Programmer to it, I see the following error:

2021-09-22T23:30:07.590Z INFO Using USB SDFU protocol to communicate with target
2021-09-22T23:30:07.608Z ERROR Error when calling version command: Error: Error message for known response code from DFU target: The data object didn't match firmware/hardware, or missing crypto signature, or malformed protocol buffer, or command parse failed.
2021-09-22T23:30:07.608Z ERROR Error when fetching device versions: TypeError: Cannot read property 'part' of undefined

Does anyone have a suggestion as to what might be the issue here? I'm suspecting I might have to repackage that hex file, or that I'm missing some other steps besides simply flashing it.

Thanks!

[Einar Thorsrud]

Hi,

I was not able to test today, but I thought that .hex should include the correct public key. In any case the hex file that is currently used in production is attached here: 3250.graviton_bootloader_mbr_v1.0.1.hex. Can you test with that? If that also fails then we need to look a bit in other directions.

[Chris Pearson]

Thanks, but unfortunately I still get the same error in the Connect Programmer.

I've tried flashing that file in a couple of ways, such as using the J-Link Flash and erasing the chip then flashing the hex file, and with nrfjprog with the command:

nrfjprog -f nrf52 --program 3250.graviton_bootloader_mbr_v1.0.1.hex --chiperase

I have not yet tried this on another nRF52840 dongle that I have, mainly because it still has the factory bootloader and I don't want to risk losing the BLE scanner ability.  However, if there's a good reason to try that as a test, I could do it -- there's a SWD socket soldered onto it.

[Chris Pearson]

It appears the core problem is actually my install of nRF Connect Desktop. I spun up a clean Windows VM, installed nRF Connect Desktop, and the Programmer showed the memory layout of the "problem" dongle without the errors seen on the VM's host PC.

Previously this PC would successfully flash the nRF52840 dongle with nRF Connect Desktop's Programmer. It also does not have any other problems related to USB (that I'm aware of) and works with other devices successfully, including a J-Link. Various scans of the PC seem to show that all is well, such as sfc /scannow, so I'm working under the assumption that something is corrupted with nRF Connect Desktop.

To try to troubleshoot this, I've been attempting to cleanly uninstall nRF Connect Desktop. This has proven to be easier said than done. The uninstaller seems to only delete the main program, which seems to be in %LocalAppData%\Programs\nrfconnect. It does not delete %UserProfile%\.nrfconnect-apps, which has the interesting side effect of making all the previously install apps immediately available when nRF Connect Desktop is reinstalled. Finally, it also does not delete %LocalAppData%\nrfconnect-updater nor %AppData%\nrfconnect. Deleting all of these directories, then reinstalling nRF Connect Desktop, does not solve the problem.

Needless to say, given how much is left behind by the uninstaller, I'm not convinced that I can get a clean install of nRF Connect Desktop. 

Any input on what might be wrong here would be appreciated. 

[Einar Thorsrud]

Hi,

This is an odd issue. It looks like you have found and deleted everything here before re-installing. You have only tried the programmer app, right? What if you try the nRF Connect BLE app? That should automatically flash the latest connectivity firmware version via USB DFU if it is not currently present. It would be intersting to see if you get the same issue or not. And if you do, can you upload the logs from both here and when using the programmer app? (to get full logs, click on the "Open log file" icon in the upper right corner of the log window).

[Chris Pearson]

Hi Einar. (How can I link your name? I can't find it with the @<USER NAME>)

I have tried it with the Connect BLE app. I had meant to include that in the original post, but I guess it got lost in editing. The error is essentially the same, although only one line in length:
2021-09-24T14:42:14.181Z ERROR Failed to setup device: Error message for known response code from DFU target: The data object didn't match firmware/hardware, or missing crypto signature, or malformed protocol buffer, or command parse failed.

Attached are the two log files. (I wish I'd looked into them when I was trying to uninstall everything, since they seem to contain all the needed paths. ) They are the error logs you asked for: "Host PC - Programmer connecting to dongle.txt" and "Host PC - BLE attempting to write.txt".

Anyway, I do appreciate whatever help you can give here. Using a VM to use the Connect Programmer is obviously not a very good solution.

Fullscreen Host PC - Programmer connecting to dongle.txt Download

2021-09-24T14:44:01.659Z INFO Application data folder: C:\Users\Chris\AppData\Roaming\nrfconnect\pc-nrfconnect-programmer
2021-09-24T14:44:01.710Z DEBUG App pc-nrfconnect-programmer v1.4.11 official
2021-09-24T14:44:01.710Z DEBUG App path: C:\Users\Chris\.nrfconnect-apps\node_modules\pc-nrfconnect-programmer
2021-09-24T14:44:01.710Z DEBUG nRFConnect 3.7.1, required by the app is (^3.6.0)
2021-09-24T14:44:01.710Z DEBUG nRFConnect path: C:\Users\Chris\AppData\Local\Programs\nrfconnect\resources\app.asar
2021-09-24T14:44:01.710Z DEBUG HomeDir: C:\Users\Chris
2021-09-24T14:44:01.710Z DEBUG TmpDir: C:\Users\Chris\AppData\Local\Temp
2021-09-24T14:44:01.721Z INFO Using nrfjprog library 10.12.1, pc-nrfjprog-js 1.7.6
2021-09-24T14:44:08.486Z INFO Using USB SDFU protocol to communicate with target
2021-09-24T14:44:08.506Z ERROR Error when calling version command: Error: Error message for known response code from DFU target: The data object didn't match firmware/hardware, or missing crypto signature, or malformed protocol buffer, or command parse failed.
2021-09-24T14:44:08.506Z ERROR Error when fetching device versions: TypeError: Cannot read property 'part' of undefined

Fullscreen Host PC - BLE attempting to write.txt Download

2021-09-24T14:41:42.314Z INFO Application data folder: C:\Users\Chris\AppData\Roaming\nrfconnect\pc-nrfconnect-ble
2021-09-24T14:41:42.364Z DEBUG App pc-nrfconnect-ble v2.5.3 official
2021-09-24T14:41:42.364Z DEBUG App path: C:\Users\Chris\.nrfconnect-apps\node_modules\pc-nrfconnect-ble
2021-09-24T14:41:42.364Z DEBUG nRFConnect 3.7.1, required by the app is (^3.6.0)
2021-09-24T14:41:42.364Z DEBUG nRFConnect path: C:\Users\Chris\AppData\Local\Programs\nrfconnect\resources\app.asar
2021-09-24T14:41:42.364Z DEBUG HomeDir: C:\Users\Chris
2021-09-24T14:41:42.364Z DEBUG TmpDir: C:\Users\Chris\AppData\Local\Temp
2021-09-24T14:41:42.515Z INFO Updated list of uuids with data from https://github.com/NordicSemiconductor/bluetooth-numbers-database/tree/master/v1
2021-09-24T14:42:14.181Z ERROR Failed to setup device: Error message for known response code from DFU target: The data object didn't match firmware/hardware, or missing crypto signature, or malformed protocol buffer, or command parse failed.

[Einar Thorsrud]

Hi,

This seems quite strange. I checked with the lead developer and he was not able to explain this, nor had he ever seen this behavior before. I will let you know if we come up with a workaround, but I suspect that will not happen until the next major release of nRF Connect for Desktop (that should happen in the not too distant future).