Idiotproof install e/OS on FP5

/e/OS Devices Fairphone
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Hi,

I had to reinstall stock android because I forgot to log out of my Google account and remove screen lock prior to install…

(well initially I did, but it took me a few tries to succeed in installing e/OS and had to set up my phone again inbetween because I was exhausted and needed a functional phone before attemping to install e/OS again… and then I forgot to remove my Google account again… :face_with_bags_under_eyes:)

I tried both command line and installer methods, I don’t remember what was my device SPL then, except that it was older than the 2026-09-05 one, probably July or something.
Installer managed to install e/OS fine, I just lacked the screen lock feature due to the Google account thingie.
Post install, device SPL updated to 2026-09-05.

I thought it was fine, since the documentation shows this:

official /e/OS A15 Security patch: 2026-09-05

Except the installer says otherwise:

Capture d’écran du 2026-10-17 14-44-15
Capture d’écran du 2026-10-17 14-44-15415×439 27.1 KB

Builds’ page shows this:
Android 15
4.3
17 sept. 2026
ASP : 1 sept. 2026

Re-reading the command line documentation, if I use the little table and change it to my dates, it does sound like I’m in the clear though:

Device SPL /e/OS build SPL /e/OS rollback date Result
2026-09-05 2026-09-01 2026-09-05 Shrödinger’s brick?

So, is the installer right? What am I missing?

Thanks in advance

X.

2

Where do you see this?

If you just run the installer with current /e/OS, then Sept 2026 will the seen SPL.

This however would be no refection of the index registered at the time of unlock.

When the accurate Android SPL is unrecorded, one would have to rely on your best guess for “History”. No one has so far recorded whether some fastboot command can reveal RIL.

3

Thank you for your reply! unfortunately I fear I don’t have the technical skills to understand what you wrote fully. (I don’t know what’s the “refection of the index registered” nor “RIL”.)

I installed e/OS, then reinstalled FPOS. Then I tried to install e/OS again through the Web installer, with my phone currently running FPOS. That’s where I get the error message in the screenshot.

I think I’ll just wait for the next release to be safe then.

4

When you come to lock I expect the installer to refer you to the manual install page Install /e/OS on a Fairphone - Fairphone 5 - "FP5" | /e/OS documentation.

Maybe one has to read that page as many times as necessary to fully understand it.

  • My apologies for using terms that diverge from that page. I should have avoided that.

Edit.

Re-reading the install page I see that the present tense is used to explain the moment of UNLOCK.

For you that was in the past.

The page includes that all that happened during your “unlocked journey” is IGNORED.

So in the context

“Device SPL” there refers to the date seen at time of Unlock (“effectively burned”, into the deviceRIL) representing the

“Last time locked” Android SPL.

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