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Date of registration: Jan 13th 2010

Posts: 3


Wednesday, October 6th 2010, 12:03pm

J-Trace M3 not enumerating


I used my J-Trace about a week ago and all was fine. Today, I re-connected my J-Trace and now it does not even try to enumerate. Only the Power led is on. I tried different USB cables, other PC's - nothing! My J-Link is still working fine.

Could it be something to do with v4.20g that I installed? This was the first time that I connected my J-Trace to my PC after I installed v4.20g of the J-Link driver. But now it do not even want to try to enumerate on any PC, regardless of the J-Link driver.

Is this the end of my J-Trace? ;(

Any help would be highly appreciated.



Super Moderator

Date of registration: Dec 18th 2007

Posts: 1,516


Wednesday, October 6th 2010, 3:53pm

Hi Gawie,

we are not aware of this kind of problems with V4.20g
Did you perform a firmware update after installing V4.20g?
If yes, was the firmware update successful or was there any error output?

Best regards



Date of registration: Jan 13th 2010

Posts: 3


Wednesday, October 6th 2010, 6:23pm

Hi Alex

No, there was no firmware upgrade after I installed V4.20g. There was a fw upgarde early Sept (last month), but it worked fine afterwards.

I suspect that something went bad on the USB side as it does not even try to enumerate once connected - maybe some hardware fault ?( . But it is very funny - it was lying on my desk (unconnected) for about a week and when I connect it again, gone is the USB enumeration.

Any other suggestions or should I send it back for a replacement?