FP3: device not found by fastboot, drivers missing?

Hello,
I received my FP3 today and tried to install /e/os on it.
The bootloader is unlocked and USB debugging is enabled.
I am on windows and I installed adb drivers from this website as given by the official /e/os website: https://adb.clockworkmod.com/

When my phone is up, adb devices recognizes my FP and I am able to restart in fastboot mode with it.
But when I am in fastboot mode, fastboot devices doesn’t recognize my FP anymore.

After some research on internet, I suspect that the fastboot drivers are not installed? What link may I download them? Or is it something else?
Also, in fastboot mode, it is stated: “DEVICE STATE - locked”, is this alright?

Thank you!
Ardakaniz

Please follow the official install guide … Install /e/ on a Fairphone FP3/3+ - “FP3”

Search results for 'FP3 fastboot drivers' - /e/ community gives this …