[HELP] I urgently need to install AGH to GL-XE300

[admon]

First of all you need to understand that all steps now are more or less experimental. So be prepared to brick (and debrick) your router

Here are a few links you should read.

exroot
That’s the way to use the space on SD card for adding it up to the system memory.

• X750v2 Spitz not enough space for plugins?
• How to expand the "disk space" of gl router by exroot?
• [HELP] SD card split (plugins + lan storage)

Installing AdGuard Home

• Script: Update AdGuard Home

Debricking the device

• Debrick via Uboot - GL.iNet Router Docs 4

But: If AGH isn’t installed by default it can happen that the device is not capable of using it.