JLink firmware update broke JLink disk drive

[nrbrook]

After Installing JLink 6.62 it offered a firmware update for the connected JLink. I performed the update (Firmware: J-Link OB-SAM3U128-V2-NordicSemi compiled Jan 21 2020 17:30:48) and now the JLink doesn't appear as a mass storage device. In Device Manager it says

This device cannot start. (Code 10)

The I/O device is configured incorrectly or the configuration parameters to the driver are incorrect.

A device with an older firmware still works. Is there a way to reverse this firmware update? I've also emailed SEGGER about this issue but I'm not sure who is responsible.

[nrbrook]

I fixed it. I installed JLink 6.44e and used JLink configurator to install the old firmware (right click on connected JLink and choose "Replace firmware") (Firmware: J-Link OB-SAM3U128-V2-NordicSemi compiled Jan  7 2019 14:07:15). JLink commander 6.64 asks to update the firmware every time so it would be good to see a fix for this issue

[savenlid]

Hi,

I have same problem.

I try to do the same downgrade but it wont downgrade.

And i find nowhere to bypass or select firmware.

Updating firmware of 1 emulator:
Updating firmware of emulator 1 of 1 via USB (SN: 960023899)... Not updated, emulator firmware is newer than host firmware.
Finished updating 1 emulator!

[nrbrook]

Choose "Replace firmware" instead of update firmware.

[savenlid]

Thanks, I used 6.44i and it shows host FW February 19 -2019
That did not work, maybe its unrelated.

What letter of 6.44? did you use to get January 7th -2019 ?

[nrbrook]

6.44e