Fairphone 4

Overview

Codename:	FP4
Android:	13
Flavors:	Slim
First released:	2025-05-30
Firmware:	included
Encryption:	FBEv2
Relockable:	yes
VerifiedBoot (AVB):	v2.0
Verified & tested by:	The AXP.OS community
State:	stable

Installation guide

You want to switch between flavors or coming from DivestOS?

Please read this first: All about AXP.OS flavors If you miss a flavor you can request it here.

Known issues

• General Known Issues

• Issue tracker won’t fix

Boot modes

Each device has its own method to access special boot modes.
See: FP4 (@LineageOS wiki)

Firmware

AXP.OS for the Fairphone 4 includes the latest available bootloader and modem firmware.
No manual firmware flashing needed if you follow the Install guide.

Install / Upgrade

Install (A/B)

Setup AXP.OS

Follow Setup

Re-locking the bootloader

Supported: yes

Follow Bootloader-Lock

Fingerprint information

On boot you may see a fingerprint/ID verifying AVB trust.
Some devices show only 8 chars, others full digest.
See more details here.

This fingerprint is unique per device and flavor.

If you see a different ID, immediately request support.

Slim build

BOOTLOADER minimal ID
        272DE007

BOOTLOADER full ID:
        272DE00712A447F3
        4AC484EB5E9A1A28
        3217A7174855F2EE
        1A4E16C591592826

XDA thread

See here

Debugging

DEVICE-BOOT-DEBUG-PATH: /metadata
See Logs

Download