Try importing tsi again and if that doesn’t work then it might be time to flash its firm ware that is if it isn’t from the recent batch I would think those come with the new firmware
When I connect to computer it may light up, sometimes all the lights will be on
and when I try to re connect to computer on another occasion it may not light up at all.
I’ve also noticed if you pick up the Midi Fighter the lights flicker on and off,
it’s seems like there could be something wrong with the usb connection on the Midi fighter itself.
Do you get the start up snake? you’ll know what it is if you’ve seen it.
If not you’ll have to head to the stickies!
Try the first part of this one (hold down the corners):
How to flash your MF
Thou I suspect that will fail so head to this one:
Bootloader mode manually
And follw it then head back to the first link and follow the Mac or PC guide (ProTip:- The PC way is 100x easier so do that if you can).
O and get the .hex file here:
SourceForge MidiFighter