How to erase a protected firmware program (knowing the protected password)

RE: How to erase a protected firmware program (knowing the protected password)

Amanda Hsieh — Fri, 07 May 2021 11:10:30 GMT

Do you refer to this thread to modify the connection?

-Amanda H.

RE: How to erase a protected firmware program (knowing the protected password)

JamesD — Fri, 07 May 2021 11:03:58 GMT

Amanda Hsieh Is there a way to erase the memory of my custom device from the J-Link commander perhaps?

RE: How to erase a protected firmware program (knowing the protected password)

JamesD — Fri, 07 May 2021 09:17:37 GMT

VTref is at 3.3v according to J-Link commander.

Checking out the post you've sent now

RE: How to erase a protected firmware program (knowing the protected password)

Amanda Hsieh — Fri, 07 May 2021 09:07:29 GMT

Hi,

Have a look at the connection in this thread.

[quote user="JamesD"]I'm connecting the device via USB, so I'm not familiar with how to check the voltage to the SDK?[/quote]

Open J-Link Commander, and check the VTref as the figure I replied in the previous.

-Amanda H.

RE: How to erase a protected firmware program (knowing the protected password)

JamesD — Fri, 07 May 2021 08:36:00 GMT

Hi again Amanda,

thanks for taking the time to respond so far,

Wiring now is as followed:

So I'm currently not using the debug output to connect with the device

I've provided power to the custom device by batteries now, no change in the result.

I'm connecting the device via USB, so I'm not familiar with how to check the voltage to the SDK?

log via commandline command:
nrfjprog.exe -f NRF52 --recover --log:
devzone.nordicsemi.com/.../0250.log.log

RE: How to erase a protected firmware program (knowing the protected password)

Amanda Hsieh — Fri, 07 May 2021 08:03:21 GMT

Hi James,

[quote user="JamesD"]I can put batteries to the unit if that would be better?[/quote]

No, just give power by J2.

Here is the https://www.nordicsemi.com/Software-and-tools/Development-Tools/nRF-Command-Line-Tools.

How do you connect your hardware device with nRF52DK? Could you provide the picture? Do you use DK's Debug output to connect with your custom device? Please also provide the power to the custom device separately.

What voltage of VTref does the J-Link Commander get? Please check by the J-Link Commander and make sure it detects VTref as 3.3v.

-Amanda H.

RE: How to erase a protected firmware program (knowing the protected password)

JamesD — Thu, 06 May 2021 14:03:26 GMT

Hi,

2.93V is the output on the VDD to my device of the SDK. (I can put batteries to the unit if that would be better?)
The password I use only to get inside the firmware of the device when I connect with Bluetooth, ensuring no external people can read it out.
It has no further purpose

I don't have a command line tool, which would you recommend?

here's a pick of the sdk voltage readout:

RE: How to erase a protected firmware program (knowing the protected password)

Amanda Hsieh — Thu, 06 May 2021 11:38:43 GMT

Hi,

[quote user=""]I assume this is because the device is password protected. I know this password[/quote]

What is the password used for? Why don't you use the password if you know that?

What is your command-line tool version? You can check by typing nrfjprog -v, and provide the log.

Do you use DK's Debug output to connect with your custom device? If so, please also provide the power to the custom device.

What voltage of VTref does the J-Link Commander get? Please make sure it detects VTref as 3.3v.

-Amanda H.