Herelink ground unit bricked

I have a Herelink Ground Unit.

  • Unit was on FRU01260324

  • Ran flasher_win.exe which reverted to Android 7.1.2 / N2G47J

  • ADB no longer sees device

  • Hardware fastboot button combos not working

  • Unit will not present on USB in any mode

without USB, the unit is bricked. How do I un-brick?