@3dpotter
FOUND SOLUTION.
After connection is established in BOSSA, you then plug in the reset jumper for 1 second. And then push the update. Update installs normally, but then after board is rebooted, diag light is off and board shows up correctly in device manager/yat.
This means for unresponsive boards you have to leave the reset pin in until you can connect with BOSSA, and then take it out, reconnect/relaunch again, and then do the step I listed above. This just saved like 10+ boards. woot.