If you’ve forgotten the screen lock password the only option left would be resetting it via hardware buttons in recovery mode.
To enter recovery mode –
Turn OFF the phone
Press Volume Down and Power button. As soon as LG logo appears on screen, release the power button and hold it back again until you see the white “Factory data reset” screen. In the entire process, we’ve to keep holding the volume down button.
We’re now in recovery mode. In this mode, the touchscreen doesn’t work.
Move down with volume button to “Yes” as shown above and confirm this action with Power button
Again press the volume down button to “Yes” and confirm with the power button to initiate the factory reset process.
The rest of the process is same as done before. You’ll be taken to “Welcome” screen of the setup wizard. Just complete the setup to land to the home screen.
LG Aristo Factory Reset via TWRP Custom Recovery –
If TWRP is installed the previous methods won’t work.
The “factory reset” via Settings or Recovery Mode will get stuck at TWRP screen.
When your LG Aristo boots to TWRP, select “Wipe” to perform a factory reset.
Slide the bar towards the right to confirm the action.
On completion of the process, you’ll see “Factory Reset Complete” on top of the screen as shown above
Click on “Reboot System”
As the bootloader is unlocked you’ll see a warning on the screen. It’s normal, press the power key to proceed.
This will take you to Welcome screen of the setup wizard. The rest of the process as same as done before. Just complete the setup wizard and you’re done.
If facing any issue let me know via the comment section below.