FP3+ no USB conection via fastboot, unlocking bootloader not possible

[Anonyme]

Here is something that worked perfectly for me:

[HOWTO] Fairphone 3/3+ stuck in fastboot/bootloader mode with the Easy Installer on Windows

Disponible en français ici. You are trying to install /e/OS on your Fairphone 3/3+ with the Easy installer on Windows, but you are stuck at the “Start device in Fastboot mode” step on the Easy installer and a black screen with a green “Start” on top of the Fairphone 3/3+? [Start the device in Fastboot mode] If so, follow these few steps to unblock the situation. You don’t need to unplug your Fairphone 3/3+, but if you did and you can’t get anything or are lost, press a volume button to scrol…