ready for a novel?
sure- it can be an electrical issue. as i had my problem, i never tried it out with a hub. if it is an electrical issue, you have to expect that your tab will make errors sooner or later.
the solution i talk about is risky. its your own risk!!!
you need usb-hub, keypad (or keyboard+mouse), bootable usb-stick (or a zalman ve-300) with win10_x86 (download .iso from microsoft) and maybe a smartphone to make photos of your steps...
the flash program is just called 'update.exe' and if you start it, it will take the bios with the ending '.fd' (in the same register) and flash it without any question!!!
(i know it, as i started the program today by mistake...)
so download the 'chuwi vi8 bios restore defaults.zip' unzip it and REMOVE 'vi8 CHUWI.W86JFBNR01.fd' !!!!!!!!!!!!
if you have the same bios then i (backcover: Model hi8 CWI509; z3736f andr4.4 + win10), then your bios is 8gb big (HI8BIOS.zip; registername: H1D_S806_4gb_CHUWI_N080JCE_206_6.1; Biosname: bios.bin Date: 05302015 15:29) (download from chuwi)
rename bios.bin to (example) 'hi8super.fd' (important is only '.fd') and put it in the unziped register.
if you have read the HOLE-text and you are willing to do then... execute 'update.exe'
the prg will finish 'bios-update'
You now will have (your!) bios with standard settings. in standard usb is activated.
it could be that now the tab will not start to boot win10 an brakes with a blue-display (i dont say bluescreen!) with a message that someting booting not fits (Recovery- your pc needs to be repaird... bcd...error code 0xc0000034)
i think that means, that your bios doesnt jumps correct to win-bootsector of the emmc.
if it is so, you need now the win10x86-stick.
switch off. (push powerbutton for about 10sek.)
connect keypad and stick to hub and hub to tab.
go into uefi (bios) (push and hold 'vol-up' then add to this 'power'. hold till display switched on. unhold 'power'. unhold 'vol-up' if you are in bios-main-menu.
disconnect usb-plug from tab and reconnect. this initialize keypad with tab.
sometimes it needs more than on try to start bios.
select efi-sector (i mean your stick. not the ...0x20000)
your stick should work and 'windows'-window should appeare. select language an go on.
sorry now: i am german and i dont know the exact english names who appeares in windows-settings.
in next window: DONT 'INSTALL' !!! select computerrepair!
in option-menu select problem-treatment (the tool-icon)
advanced options not 'reset-pc'!!!
then start-help (gear-symbol)
Diagnose is running
message appears that start-help could not repair the system.
hmm.. advanced options
select: use a device
select your usb-stick (i had to select dvd for my zalman-dvd-emulator)
than comes someting strange:
a message that system has no (in my way: dvd-) option.
with ok i arrived in bios boot-manager
there were 3 bootoptions there:
win boot manager
i didnt start an option.
i switched tab off (10sek power)
i disconnected usb-drive (my zalman) an connected keypad direct to tab
normal power on
old win10 is still there and activated.
no touchscreen but keypad works.
in devicemanager silead 'kmdf hid minidriver for touch i2c device' problems
update driver (win10 driver and double-driver from chuwi) brings install error
normal power down
secure boot options
administer secure boot: enfore secure boot: disabled
save and reboot
touch is working
backcam still not works, but i dont need it.