Unable to flash MDBT42Q with either Native WebIDE or Chrome - board now locked and unusable [SOLVED #13 post]

does Web Bluetooth work running in a Linux - such as Ubuntu - as guest in virtual box vm

Oof. Maybe, but I wouldn't hold out high hopes. If you're going to do that I'd either:

• Use a Raspberry Pi
  
• Install Ubuntu on a USB stick (super easy), reboot into it, and use Chromium/Chrome web browser on there to do the update
  
  

Or in the UK you can buy Android mobile phones good enough for flashing brand new for around £30, so I doubt they'd be more than $40 in the US - even less if you go second hand.