In update.zip script or via post-fs-data.sh :
If you are reading this article, you are likely the exact user who needs local ADB/Fastboot tools. It is a lightweight (4 MB), open-source module maintained by the community. It turns your rooted Android device into a standalone development tool.
Crucially, you must be in the bootloader to use Fastboot commands, but you can execute them from within Android using this module combined with a reboot. download adb fastboot for android ndk magisk module
This method is useful if you want to run ADB/Fastboot (not from a PC) – for example, to troubleshoot another device, flash partitions from the device itself, or use ADB over network without a computer.
Create udev rules for device access (example snippet): In update
Install an app like Termux or Terminal Emulator from the Play Store.
Control your phone via terminal (Termux) or ADB shell directly. Crucially, you must be in the bootloader to
Tap the button to restart your device and activate the binaries. How to Verify the Installation
(OTG cable or network):