Tacker won't connect or pair after firmware update

after the firmware update one of my 7 trackers refuses to connect to the base stations when turned on (green light). I’ve also tried to pair up the tracker again, but the tracker refuses to go in to pairing mode (flashing blue light) and just turns off if i hold it long enough. it seems to be charging ok. any ideas to fix this issue?

What firmware update are you referring to? The one from Steam?

yes that right. when steamvr lets you know there is updates available when you first time use the trackers. i’ve plugged in the tracker to PC using the cable provided. 6 out of the 7 updated without any issues. but this one doesn’t want to connect any more