Fairphone 4 Android 12 to 13 Upgrade

Install platform-tools on a computer
Installing adb and fastboot on a Linux PC
Installing adb and fastboot on Windows PC

Download this file e-2.4.1-t-20241009439851-official-FP4.zip on the computer, (put it into the platform-tools folder)
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Boot the phone into recovery mode.
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Select Apply Update, then Apply from ADB

The screen should now change and the output at the bottom ask you to send the package from your computer.

On the computer issue command to sideload the eOS installation zip.

adb sideload e-2.4.1-t-20241009439851-official-FP4.zip

the phone screen will be mostly blank with just the output at the bottom showing progress.

On the computer the sideloading shows progress as a percentage figure that will stop at 47%. The phone will still be installing though (even though it might feel like nothing is happening sometimes!) and you can expect to see the following screens

Then press the arrow at the top of the screen to return to Home Screen

Tap Reboot system now to boot into eOS.

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