OTA update FP4 to /e/OS v1.6

I recently got a new FP4 and installed /e/OS v1.51 on it (using the manual install option, i.e from the image download). I saw that the v1.6 image is now available and I would like to update my system.


  • The system updater does not find a new version, but still shows v1.51 and “no new updates found”. I refreshed a couple of times in the last few days, still no luck. Is this expected? Does it just take some time for the update to become available?
  • The manual upgrade was unsuccessful and failed with some verification errors during the adb sideload process. I’m using the official image, so I don’t know why this would happen. (I locked my bootloader again after installing the v1.51 image, is that the issue?)

I would appreciate if someone can provide any insights on this. Thanks!

Usually FP4 builds take a few days longer to be released via OTA than other phones. I think it’s due to additional testing or a lack of test devices but I’m not sure. Once the update is released however it installs like any other OTA update. The bootloader doesn’t need to be unlocked when updating via OTA (I’m not sure if it is required for sideloading).
If you encounter further issues it would be helpful if you could specify the Android version of /e/OS on your device (/e/v1.X-q = based on Android 10, /e/v1.X-r = based on Android 11, /e/v1.X-s = based on Android 12) and if you are using the development or the stable build.

Thanks, I will wait a little longer then :slight_smile:

I’m using the the “S dev” Android 12 version. The full version code is: /e/OS 1.51-s-20221103231515-dev-FP4 (as shown in the updater.)

As for the sideload update, this is the error message I get on the device screen:

Supported API: 3
Finding update package...
Verifying update package...
E:footer is wrong
Update package verification took 0.1 s (result 1).
E:Signature verification failed
E:error: 21

For the update I was using the image file: IMG-e-1.6-s-20221201239247-dev-FP4.zip

It then gives me the choice to “Install anyway?” but I’m hesitant because I don’t want to brick my device. Anyone else having this problem?

I do not have an FP4, but an FP3. For me, all zips starting with IMG are not suitable for sideloading. They can only be flashed with fastboot.
Images that can be sideloaded start with e.

Interesting, and I think you’re right - there is a difference between those files. If I look at the downloads from


then the FP4 images all start with “IMG-” while FP3 starts with “e-”.

Now the FP3 “e” files have very different content (mainly a payload.bin with some other files, no scripts or anything[1]) than the FP4 “IMG” files (which contain system.img etc. along with flash_FP4_factory.sh.) If the FP3 image is sideload-able, then I can see how this doesn’t work with the FP4. The instructions at /e/OS Version Upgrade do not mention this, however.

[1] Worth noting that this contradicts the instructions at Install /e/OS on a Fairphone FP3/3+ - “FP3” which mention a flash_FP3_factory.sh that is not to be found anywhere in the downloads. I think the FP3 instructions are out of date?

EDIT: The OTA update appeared today on my system and worked without issues. My phone is now on 1.6-s-20221202239247-dev-FP4.

Until now, I don’t see the update… but I don’t matter and I wait, this happened also with previously update.

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I also didn’t get it yet. It will be here in a day or two

There is no update option for my FP4 with eos 1.5.1 S yet.

i still can’t perform a ota update. why does the update option for fairphone 4 come so delayed?

I’ve got four Murena’s FP4 phones all bought in an attempt to improve the privacy of my team at work.

Two phones on v1.5.1, one on v1.4, and one on v1.2, none having displayed the option to update to v1.6. Hoping this last update would fix a plethora of bugs, but so far nothing.

I’m starting to think this endeavor was a waste of money.

Edit: test releases show up fine when developer options are activated, but don’t want to risk due to previously stated reasons.

Dear all,
Please let me know if any of you still face this issue.
One possible issue that you can face, is likely caused by the fact that FP4 needs to move from Android 11 base to Android 12 base.
For people who are on a DEV image, you will need to manually download and install “Android S” based DEV version for your phone, using ADB.
You will get an error if you try to install STABLE version on top of a DEV version.
The images are available on /e/ image ROM download
Also, you cannot use the IMG files for update, you need to download the OTA files, by deleting “IMG-” from the web link, e.g.:
https://images.ecloud.global/dev/FP4/IMG-e-1.5.1-s-20221103231515-dev-FP4.zip : Wrong file, it is for fresh install

https://images.ecloud.global/dev/FP4/e-1.5.1-s-20221103231515-dev-FP4.zip : Right file, for update.