Download link here. [vwairboxupdate.bin] [November 2018]
More info here.
PLEASE do NOT cut power or operate the unit when the progression bar on the screen.
Put "vwairboxupdate.bin" in the root of a FAT32 USB drive
Plug the USB into the USB port of the unit
Go to setting->system version->long press the text of the system version-> enter "7890" as passcode->press 'OK'->press 'MCU upgrade'->toggle the settings on top several times and choose 'air pane'->press 'XFY'->reboot the unit after the progression bar disappears