Wileyfox Swift - degoogle

Hello, I am trying to degoogle my first phone, Wileyfox Swift.
Unfortunately I got into problems straight away.

Adb recognises my device, but as soon as input 'adb reboot bootloader', the device just crack. See the image below.
Indeed the fastboot is not recognised either.

I am stuck at the beginning, I don't understand why.. Does someone have an idea about it, please?
If it helps, my bootloader version is: crackling-12-ge9dcde6
Can this be the problem?

I also created a Create a new...

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