CC2531 no led: is it broken?

Hello everyone!
just a bit intro:
I had my rpi2 with cc2531 and zigbee2mqtt up and running for one year, than 2-3 weeks ago some zbee devices were missing ( can’t recall if after a power failure at home ) or better : could not find entity.
A couple of reboot-plug-unplug of the adapter and restarted to work.

but now again…
the adapter seems dead, on rpi doesn’t show up ( no /dev/ttyacm0 or whatever), on windows ( usbloview ) does show nothing, no bell upon connecting, no led although on pin 1 and 2 I can read 3v3.

Is is worth try to reflash ( had to find the cable and re-solder it)?
someone experieced the same thing.?

I’ am now tempted on conbee 2…

Thank!!