Manually install Fairphone OS for the Fairphone not working

[Raul]

Hello again. I have done this:

Need help installing openos

I assume you didn’t install fastboot yet neither on your Linux nor on your Windows machine, because it’s not clearly stated in the instructions. Correct? On Linux Mint you should install android-tools-fastboot. The command should be similar or same to sudo apt-get install android-tools-fastboot (I’m on Ubuntu, that’s why I’m not absolutely sure about the correct command) After that you should connect your phone after booting it into fastboot (Power + Vol-) mode (USB debugging has to be acti…

But the terminal does nothing :

matariles@matariles-Lenovo-ideapad-520-15IKB:~$ sudo fastboot devices
[sudo] contrasenya per a matariles:
matariles@matariles-Lenovo-ideapad-520-15IKB:~$ /usr/bin/fastboot devices
matariles@matariles-Lenovo-ideapad-520-15IKB:~$

Previously I did also:

@Freubert

sudo apt-get install android-tools-fastboot

and:

matariles@matariles-Lenovo-ideapad-520-15IKB:~/Baixades/fp2-gms-18.09.2-manual$ sudo sh flash-for-unix.sh
[sudo] contrasenya per a matariles:
** Fairphone OS 18.09.2 Manual Flashing Script **

Validating files…
Validation complete.

WARNING: No Fairphone 2 found in fastboot mode.
WARNING: Make sure that a Fairphone 2 is connected.
WARNING: To check for devices, type ‘/usr/bin/fastboot devices’.

matariles@matariles-Lenovo-ideapad-520-15IKB:~$ adb devices
List of devices attached

I have the Phone rooted and usb debugging activated. Maybe it’s not important in fastboot but there is no chance to change from charging mode to MTP transfer mode. Does nothing…
Any advice, please?