Where to download the FP3-REL-Q-3.A.0136-.gms-7c69ec7e-user-fastbootimage.7z?

[yvmuell]

Maybe this gives a hint or you might know someone who has some experience to help you with this?

@AnotherElk

2. Get the fastboot command to work / Fastboot-Kommando lauffähig machen

• Download the Android SDK Platform Tools / Android SDK Platform Tools herunterladen
• Extract the downloaded ZIP file to somewhere you can find it / Das heruntergeladene ZIP-Archiv auf dem Computer irgendwohin entpacken, wo man es wiederfindet
• Open a Windows command prompt (cmd) or a Linux/MacOS shell and change into the platform-tools directory, which got extracted from the archive

Or maybe read this

Dictionary Entry: Fastboot

What is Fastboot? Fastboot is two things (to keep things simple) A way to start up your Fairphone (FP2/FP3/FP4). This allows you to connect to your Fairphone from a computer with Fastboot Software on your computer you use to connect to a Fairphone in fastboot mode. How to start the Fairphone in Fastboot mode Disconnect your Fairphone from your computer Shutdown the Fairphone Press and hold down the Volume down button while pressing the Power button The black startup screen with the logo o…