Hello.I have a new MEDIACOM IPRO W810 3G CHUWI VX8 3G and after i changed some setting in bios (usb legacy or something) the tablet will not get into bios (pressing ESC at boot) because the keyboard is not recognized.The keyboard is recognized after the mediacom logo.If i press NUM or CAPS the light turns on.
Here are some pics with the inside of the tablet
The tablet boots into a menu

If i press f8 i get this.

This is because of a failed rollback from win10 to win8.
What i did was ground GND to Data Out (pin 2) briefly (see pic), at the right time during boot. FAILED Used the info from
this post.

Ground pin 1 and 7.FAILED
Made a usb stick bootable with win8 (rufus -uefi) connected to OTG.FAILED
Made a micro sd rufus bootable win8.FAILED
Cut the battery power wire and left it off for 1 hour and solder the wire back FAILED.
What should i do next?I would like to buy a I2c programmer with clip but i don't know what product to choose because i've read that the voltage matters.