J-link lite broke by update! Rollback?

[Karim Ladha]

Hi all,

These steps broke my j-link lite! Is there a way to un-break it? Suggestions welcome.

I updated the segger pc software for another non nRF51 project (using a real segger). I opened an nRF51 project and the new sw told me to update the j-link lite firmware; I did. I proceeded to connect to the lite after a successful firmware update. It flashes its LED red intermittently and will not connect.

5 minutes before the update I was using it with no problems so it is definitely segger's update that killed it. I can't find a way to undo this! The device is recognised by all the software but it flashes the strange intermittent red led and refuses to connect the target. Even seggers updated software won't recognise it. I've tried reinstalling everything (its already taken up 5 hours of my time so far). I just don't get what could have happened? I can update the firmware still without errors in the segger software - Is there a way to put the original firmware back on it?

I've lost all hope now... and all confidence in Segger. Unfortunately, the other J-link was for someone else so I can't even continue my own project now!

Can you think of anything I could do to fix this? Thanks

[Nguyen Hoan Hoang]

I am afraid you have a fake jlink. I bought 2 of those on eBay. It was cheap. They provided with old real segger software. I though it was real jlink. It was advertised as jlink. As soon you update to 4.7 or above. Segger will detect it a fake and place a blinky firmware in place. That is why you see that red blinky led.

[Karim Ladha]

Looks like they messed up the 'counterfeit detect' method then! This was a real one from digikey with the serial sticker on and it came sealed in tamper proof packaging. I guess I need to talk to segger then directly. This has put me off ever buying a j-link though. Deliberately breaking a device without even a pop-up window to say what they have done or why they did it is ridiculous. What a waste of precious time.... All they need to do is put a message box up to say they have disabled a 'suspected counterfeit' and provide a support contact for those who think a mistake has been made. That way they could actually find out where the fakes were coming from and avoid confusion for those who have been un-knowingly scammed. They need to sack whoever decided this was acceptable!

[Nguyen Hoan Hoang]

Well, I kind-a sympathize with them with all the fake link out there. Segger support should able to get you back on track.

[Karim Ladha]

Fixed. Turns out the that the firmware image was corrupted for unknown reasons. Run jlink.exe and type 'exec invalidatefw' from the command line then allow it to reflash the device. This allows you to re-flash again next time you use the jlink dll and fix the corruption.