bootloader verification script error

[shohidur]

I was trying to verify boot loader using the provided script. I noticed following abnormality.

--It often fails to verify and show the following error:

Reading UICR.. OK.
Reading Device page.. OK.
Resetting device.. ERROR: Invalid start sequence from bootloader: 810208fe
Checkpoints:
Have you flashed the bootloader with nrfjprog?
Does your bootloader have serial communication enabled?

--Same commands on same DK sometimes fails and works. 

However DK with error message also works fine if connected to mesh network. 

I am using nrf 52832 and mesh sdk nrf5_SDK_for_Mesh_v2.2.0_src

[Susheel Nuguru]

Hi Shohidur,

This documentation might be helpful: 

one of my colleague has similar issue and he figured out that made a command wrong, which is very easy to miss. Recommendation is to make a script of the whole procedure mentioned in the infocenter page into a script.

[shohidur]

Hi Aryan,

I have gone through this and managed to perform DFU. But I noticed one issue with verification script. Its a bit unstable. Same command executed twice behave differently. Lets say in one stage it says that there is something wrong but on next execution it says everything is okay.

[Susheel Nuguru]

that is strange, can you attach your script, so that our DFU expert can take a quick look into it. Also tell us which versions of SDK,softdevice  and hardware you are using.

[shohidur]

I used  nrf5_SDK_for_Mesh_v2.1.1 , softdevice s132_v_6.0.0, NR52 52832. Windows system

[Susheel Nuguru]

We are able to run the the commands here without any problem. Hard to say what is wrong on your side without being able to reproduce the issue.

[shohidur]

Yea, it was hard for me too, because same device was behaving differently in different time. Anyway device function normally even with this error message

[Susheel Nuguru]

This is strange, and i understand is annoying for you. But if you think that the device functions properly even with this message , then i guess you can continue your development. I still recommend you to get at the bottom of this sooner or later.