How to root the Fairphone 4

Prerequisites

• Unlock the bootloader
• Install Magisk
• Get the original boot.img of your ROM

Process

Initial Setup

• Patch the downloaded stock boot.img with Magisk
• Transfer / adb pull that patched boot.img to your PC
• Reboot to fastboot adb reboot bootloader and temporarily boot from the patched boot.img fastboot boot /path/to/patched_boot.img
  Do not flash that boot.img!!!
• Wait for the device to boot (took a bit longer than usual)
• Open the Magisk app (press Cancel when asked to perform Additional Setup), choose direct install and reboot

After OTA Update

• Download and install the update
  Do not reboot yet!!
• Open Magisk and select Install
• Choose “Install to inactive slot (after OTA)”