Pro1 not able to work with fastboot

[fire 14]

I got a problem with fastboot.  

From my PC with adb no problem, but after I did the command : adb reboot fastboot (or adb reboot bootlaoder), the phone reboot in fastboot mode but second after, got a logo screen and it says Press any key to shudown.

The command fastboot devices return nothing.  I tried many different USB cables, different port on my PC, but nothing works.  

I'm running Linux (Ubuntu 24.04), so what can I do now that I'm not tried before ?

Thanks.

[EskeRahn 5,588]

Strange as it may sound, the connection of fastboot is more picky than adb. 

Usually an older pc, a usb hub or a Linux OS seems to fix it. I primarily see the issues with Windows pc with an USB3 port.

I got the issue on mine too, but even a USB3 port on a thunderbolt docking works. 

As an old tech guy it oozes of handshaking issues, that is a bug in the driver for Windows means it can not correctly handle if things goes too fast, and an usb2 port or a hub is enough overhead for handshaking to work...