[Android Q&A, Help & Troubleshooting] arjaylzo:
I managed to get into UEFI, Able to boot several UEFI files such as grub.uefi even Windows bootx64, eventually giving out Errors during Linux Mint/debian and Ubuntu installation. Also cleared security footer in UEFI thereby getting a Prompt to Press +Vol whenever I start. So this time, my boot loader has been unlucked and secure boot is OFF for good

I even was able to FLash these UEFI images. FIrst with Linux, I extracted bootloader.img from the Stock zip coming from acer. Mounted the IMG file (I am using Linux) and replaced loader.img and also replaced efi/boot/bootx64.efi with the Grub.efi

I then unmount the IMG and flash it via

Entering DNX mode

Fastboot boot loader.img

Fastboot flash bootloader bootloader.img(which contains grub.efi)

Viola, I instantly am able to boot to Grub commandline. I am able to map my OTG Flashdrive and Boot vmlinuz and initrd. But later fails.

Turns out, the port to which the USB is under USB3 Only that the 4 pins are setup, not the additional pins for common USB3 pins.

So, as soon as windows Launch the WinPe environment, my OTG powered Hub, USB uefi enabled installer and keyboard shutsdown and stuck on the Welcome WIndows installation.

Same goes for the Linux live installer. As soon as the RootFS is loaded in the Memory and launch the Init process, the USB's quit working leading to "Missing Live squashFS".

So then I resorted with Copying the Linux installers into the /system folder. Yes I have /system RW capability since my tablet has been rooted.

Going back to the Windows Installation. I got an ACPI error. Thereby went into UEFI again and Adjusted ACPI_O5 to O4, was able to get into the welcom Installation. Still, no KB or mouse. An unattended Installation could have helped but I no longer have the resource to create Win10 unAttended plus I'ts hard to setup the Partition as I intend to install it permanently into the MMC or SD card if possible.

Worse, I made adjustment into the UEFI hoping to convert USB3 setting into legacy, As I rebooted my device, I no longer have OTG on Android, SD card no longer mounted. So that concludes that the SD card is also allocated towards the USB bridge.

This calls for a UEFI/BIOS Reset. Which I did. I then Booted TWRP and Sideload the AV0L0 stock image.zip, went through the usual flashing. But was getting error mounting some partitions. I went in and flash instead. This time i'ts slowly getting worse.

I tried re-flashing the tablet using the stock AVOLO.zip file. I thought re-locking bootloader would help since it kinda makes changes into the UEFI. So I did relock the tablet. After re-locking, I flashed the AVOLO and finally ended the life of this one. I went into a Bootloop, though DNX is still accessible. But not a chance to flash UEFI or atleast bootloader. Plus, no KB and OTG working.

I tore apart my Predator 8. Inside was pretty nifty, I removed the Main battery terminal. Let it sit for 15 mins as I smoke in desperation. While the Battery Terminal was removed, I also pressed the Power Button and Kept it press for a minute.

Time to re-assemble. Put back the battery terminal, powered on the unit, went into Recovery (twrp touch enable) plug in FlashDrive.

I've seen my FD was mounted. I was relieved. Plugged in Mouse, I saw my cursor in there. This indicates that I am able to Reset my UEFI. Also kinda Re-calibrated my battery as It was stuck on 25% since I rooted the devices. No it never went up since then. When I check to charge the table, it now showed 100%

Using Intel Flash was one of my option in totally forgetting about Android on this tablet. But, I no longer have Flashing to bootloader capability as during the re-installation of the AVOLO file to get into error, it reboot the Tablet. Thus until the time of my writing, it is rebooting upon showing the crappy Acer logo.

Again, I tore out the tablet. I was hoping the battery was just rather weak being at 4.11V where it's rating is at 4.38V. I will try to charge the unit for couple of hours. Note that when I plug the charger into the tablet, it triggers the tablet to power-on. I am guessing its the part of the AVOLO flash sequence to update bios, but since it has a weak battery, it shutsdown and goes into a loop. But luckly, I am able to charge the tablet without the Android "charger" interface, must have been corrupted by now.

I did check on the battery terminal, made a comparison. It does increases a little bit when I plug the chargers. so so sure is its charging. It's 3 in the morning and has been on this since the other night.

Shame that this tablet has so much potential but lacks the resource. Other Tablet has their respective forums, chuwi and teclas are even better.

Soon I hope that I will sort this out and upload another Video for this device booting into Linux or Windows.