First of all I want to say that I am NOT responsible of anything you do to your device.​

What is a GSI?

A generic system image (GSI) is a system image with adjusted configurations for Android devices. It’s considered a pure Android implementation with unmodified Android Open Source Project (AOSP) code that any Android device running Android 8.1 or higher can run successfully.

GSIs are used for running VTS and CTS-on-GSI tests. The system image of an Android device is replaced with a GSI then tested with the Vendor Test Suite (VTS) and the Compatibility Test Suite (CTS) to ensure that the device implements vendor interfaces correctly with the latest version of Android.

What GSI do I install?

There are multiple GSI you can choose (AOSP, LineageOS, Pixel Experience, ProtonAOSP, etc).
Here is a list of every GSI you can install: Generic System Image (GSI) list

For ROG Phone 5, you need to choose a A/B partition style and arm64 architecture GSI.

How do I install a GSI?

First of all, make a backup of your device (optional):

Factory reset your phone in recovery or Android

Now, reboot your phone into fastboot mode (shutdown then press Volume Up + Power)
Connect the phone to the PC with the side port of the phone

Make sure you have ADB and Fastboot installed, if not install this: Minimal ADB and Fastboot or this: Android SDK Platform Tools latest

Download the vbmeta and extract it: vbmeta.img

Now flash everything:

In a command prompt, type the following commands:

fastboot reboot fastboot
fastboot --disable-verity --disable-verification flash vbmeta vbmeta.img
fastboot erase system
fastboot -w flash system yourgsi.img

Replace yourgsi.img with the GSI you want to install

Now reboot your phone:

fastboot reboot

And that’s it! You successfully installed a GSI on your ROG Phone 5!

Common problems:

Not enough space to resize system partition?

If when you try to flash the GSI you get this error:

Resizing 'system' FAILED (remote: 'Not enough space to resize partition')

Then that means that your GSI is too big.

But don’t worry, there is a solution!

Just type this before flashing the GSI:

fastboot delete-logical-partition product

This will delete the product partition and let enough space for the GSI.

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