I have been working on a Universal Auto GSI installer script that will currently work with Pixel 3, 3 XL, 3a, 3a XL, 4, 4 XL, and 4a.(Later will support more phones)
In this tutorial, I show you how easy it is to install a GSI ROM using my HighOnAndroid Universal Auto GSI Installer script that can be used on r Pixel 3, 3 XL, 3a, 3a XL, 4, 4 XL, and 4a. And would also work on any phones that have Android 10 “fastbootd”, AB Slot Treble support and on Android 10 firmware.
To check if you have “fastbootd”, boot into regular fastboot and type, “fastboot reboot fastboot”. If it boots into “fastbootd” screen, you will also be able to use this script fine.
You can get the Auto GSI Installer here on our forum.