FP3: device not found by fastboot, drivers missing?

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!

Please follow the official install guide … https://doc.e.foundation/devices/FP3/install

https://community.e.foundation/search?q=FP3%20fastboot%20drivers gives this …