Hi Koko, I've tried just with the BIOS file and at least with 6 different pendrives to avoid usb problems.|
All with same result, error "ROM file ROMID............".
I'm not a patient person so I finally decided to sell my chuwi lapbook with that BIOS to a friend that only want to use windows.
I've been fortunate enough to find one with BIOS B3W6_NA14C.026, with dual OS support, and finally I could install more than one linux distro on my SSD M.2.
Leave Windows in the emmc disk and install linux on SSD works in the best way so I manage to install Ubuntu, Elementary Os, Linux Mint and Manjaro, all working and performing really well.
So I don't expect a solution regarding BIOs dual Os selection for new models................