[Miscellaneous Android Development] biorpg:
I wasn't trying to say it was TWRP's fault. I'm just warning about something that could happen, and since I'm not sure which factor cause it to brick, I should include all of them in the warning. Also, a secondary purpose for the post was to let people know that bricking the tablet with a fastboot wipe is something they'll fix under warranty.

Making sure to use a micro USB adapter that I knew was good was one of the first things I tried when I noticed the battery draining faster than charging.

My post was a vague recollection and brief.. here's what I included in the support request to Acer, which is a clearer recollection from the day after bricking it:

(Not sure why I wrote so much to be tldr'd by a technician that is going to perform standard tests anyway, but at least it's useful here..)

Description :

Powered device on while holding volume down button while plugged into PC via USB

I extracted package downloaded from here:

https://xdaforums.com/android/development/acer-predator-8-twrp-3-0-2-t3500801

I've uploaded the package here as well:

https://1drv.ms/u/s!AjsWJFGAqvlQlkW4aiKSqWqI1vKS

I opened a command prompt and performed:

fastboot flash boot unsecuredboot.img

fastboot flash recovery TWRP.img

There is confirmation of success in command prompt as well as on device's screen.

(below the illustration of an incapacitated android mascot lying on its back.)

I used the volume up button on the device to choose booting in recovery mode and pressed the power button.

The device reboots and displays a TWRP splashscreen,

I copy UPDATE-SuperSU-v2.46.zip onto a microSD card on my PC that I had split into two partitions, formatted with FAT32 and ext4, respectfully. The zip was copied to the FAT32 partition.

I inserted the microSD into the device and rebooted again.

Upon rebooting, I mounted the microSD over MTP using TWRP menus.

Then I used the TWRP menu to flash the UPDATE-SuperSU-v2.46.zip on the microSD card.

I do not recall if this was successful or not.

I rebooted the device normally. I think there was a system splashscreen. (not stock "PREDATOR")

The device reboots before fully loading the system

The device strangely boots into recovery again automatically, but powers off immediately after the menus are displayed, it continues this a few times, powering off sooner each time.

The battery was draining faster than my PC was charging it.

I manage to keep the device powered off by starting a hard shutdown (~10 second power button down) immediately after device powers itself on again.

I plug the device directly into a 5v / 4a USB wall adapter and allow it to charge for an hour.

After I felt it had charged completely, I used TWRP to wipe the Data, Cache, and Dalvik partitions and rebooted.

The device reboots and gets seemingly stuck on the (non-predator) system splash screen and reboots itself.

I press the power down button mid-reboot to get back into recovery.

I use an android tool to pack unsecuredboot.img into a zip file and attempt to flash it using TWRP.

There is an error about inaccessible partitions.

I realize then that I should start over and wipe the recovery and boot partitions.

in command prompt, (if it didn't kill itself, this is probably where I killed it) I perform:

flashboot flashall

command prompt and device screen indicate success.

Then I get distracted looking at android forums and docs.

A couple hours later, I realize the device has run its battery dead again (while idle in fastboot mode)

I attempt to turn it back on, as it could have recharged in the time since it turned off.

The device vibrates, but it is shorter than the usual power-on indication- it vibrates again, repeating every few seconds.

I try holding the power button down for long periods of time, but it would not stop.

It was still doing it when I woke in the morning and left for work.

After work it had stopped.

I plugged it back into the wall and let it charge for a few hours.

I then press the power button with no response from the device.

I try holding volume down and power button, with no response.

I try both of the above plugged into PC. and see no device activity, even within the OS internals.

I try connecting to PC with fastboot cable(USB with pin 1-4 shorted).

Still no activity on PC nor the device.

I study the device enclosure, and remove the metal screens covering its 4 speakers.

Within one of the 4 screw recessions is a tiny sticker labeled 'Void'.

I think of how recently I purchased the device and visit acer.com where I confirm device is well within warranty.

I open a claim, providing my best recollection of the actions I performed and hope that my case a generous technician.

I realize the devices state is a result of 'unsupported actions', but if the repair is of little cost to you, I ask kindly that you attempt it. <3