Problems going back to fairphone os

I will try with another computer.

For now, i have reinstalled universal adb driver as described here

With my phone into fastboot mode (hopefully, because power button and down volume button gave me a vibration as it should when entering fastboot), I now see an android device in windows device manager, but without any driver.

I can install one from my computer (for example the android adb interface or xiaomi android interface) but i’m not sure i should, as i saw different drivers for adb and fastboot or bootloader for other devices (such as google nexus).

Thank you for stopping me if i’m in the process of making another big mistake.