Installing E/OS on Fairphone 4 fails: doesnt find device

[piero]

according to Install /e/OS on a Fairphone FP4 - “FP4”

@piero

If you plan to relock the bootloader after the installlation

(not mandatoty, only available with Official version, why relocking ?)
Most important thing to take care about is the “android Security Patch Level” in the already installed Operating System on your device before you start the install process.

It must be OLDER than the “android Security Patch Level” included in the /e/OS build you want to install, otherwise you risk to change your device into Brick.

• You will find this information about stock OS on the device :

settings --> about phone --> android version 15 --> android security update

@piero

What could go wrong

[Solved] Windows does not see my phone in Fastboot mode because needed drivers are not correctly installed