Ortur Master 2 Needing to Update GRBL from 1.1f to 1.1h

I own 4 Laser Etching machines and a little 3018 that I haven’t built yet(!) but my latest acquisition, my Ortur Maser 2 15w has so far excelled my existing machines in all ways but since updating my others, I am having difficulty updating it’s GRBL from 1.1f
to 1.1h.
I’ve tried everything I can think of to no 'm avail,so I’m asking for help here please! LaserGrbl only presents me with Arduino Nano and/or Uno, neither of whichtywill flash the Ortur. Thanks for reading this,. Hopefully there will be bright spark out these who can help

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