[LG K8 (2018) Guides, News, & Discussion] Stuck-In-a-Tarpit:
Missing Touchscreen Driver on LG G8

Hello

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Background

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I have an LG K8 that I recently purchased, and decided to root. My phone was manufactured 01/2019, and has for its Model Number "LM-X210ULMG". The box advertises this phone as an unlocked (carrier) smartphone. I have read the following guide written by brad2192, and revised by parcek (Titled "lg-aristo-2-root-t3746425": Further Updated for Rooting Noobs: 10 Steps), and decided to follow through using this as a reference.

As I use Ubuntu, I was able to successfully install the appropriate packages for platform tools ADB and FASTBOOT, and connect with my phone. I acquired Magisk 16.0, and newtwrp.img, but unfortunately root_boot.img in the first post of the guide returned a 404 not found error. Later on though, I acquired root_boot.img through another link further in the thread (From Android File Host, with File ID 673956719939818308)

I then rebooted the phone into its bootloader, and flashed the boot partition with root_boot.img found in the guide. The flash was successful, so I decided to test the phone out by rebooting without flashing recovery. However, upon the entering Android setup workflow, I noticed the touchscreen did not work. The phone did not register any touch presses, but would register volume up, down, and power.

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Questions

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a. Has anyone tested this particular model of phone with rooting?

b. Has anyone else had touchscreen issues where they were not able to use the phone unless they restored from an earlier backup?

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Troubleshooting Steps Taken

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- Rebooting the phone does not work

- I've acquired LG Bridge, which is able to recognize that a device is connected, but after perhaps 20 seconds or so, LG Bridge gives up and says "Unable to detect the handset" or some similar message.

- LG UP does not recognize the device at all

- I have tried re-flashing root_boot.img to boot to see if perhaps the flashing process was botched. The touch screen still did not work. Interestingly, adjusting orientation causes artifacts where the screen is offset from the bottom by perhaps 80 to 100 pixels or so, and the screen appears to be interleaved, before more orientation adjustments cause it to go blank (backlit but all black pixels).

- I have flashed newtwrp.img to the phone, but am not able to boot into recovery using "fastboot reboot-recovery". Not sure if I have correct syntax there.

Other notes:

- For fastboot to recognize the device when in the bootloader, the USB cable **must** be plugged in to the computer first, then inserted into the phone with the volume down button held to enter fastboot mode.

- Only fastboot commands work. This is probably why it is called fastboot.

- Download mode can be launched when the USB cable is plugged into the phone with the volume up held

-- Neither LG UP, LG Bridge, adb, or fastboot recognize the device at any point in this mode

Updated Notes:

- Acquired LG UP Developer edition per Techknight's "Install LGUP Dual Mode(Dev/User) on your Windows PC". This was able to detect the com port over USB for the phone. Am now able to flash KDZ images. Going to try something close to my model, as I have not found the exact stock model image to restore to.

More Updates:

- Failed hard. Overwrote boot partition with latest TWRP recovery (TWRP with 10L kernel). Then, wrote this same image to recovery partition. Was able to reboot into Downloader mode okay (that still worked). Decided to try booting into Recovery and "adb sideload 'TecsAristo2pv2.zip'" which the command completed successfully. Then rebooted. Then bad things happened.

Now the device does not boot at all into either recovery, or fastboot. But if plugged in via USB, this device does show up as "Qualcomm HS-USB QDLoader 9008".

lol.

Welp. I'm gonna try this guide out later. "[GUIDE] Fixing hard bricks [Qualcomm HS-USB QDLoader 9008]" If anyone has any suggestions, I would love to hear them.