I just connected my Xperia X Compact to the pc in Fastboot mode (powered off, then VolUp + Insert USB cable) to follow a guide… the led is blue, but with telnet 10.42.66.66 I can’t open anything, maybe because the usb port on PC is usb3.0.
I’d like to exit fastboot now, how to? Is it safe to detach the cable and restart?
Yes 
That’s probably not it… maybe your PC hasn’t recognized the USB as a network adapter.
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Did you load the recovery image before trying to telnet?
And yes, should be safe to just detach and reboot (maybe possibly have the need to Vol-Up + Power 3s ‘hard’ reboot).
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No, I didn’t load any image, so I guess it was that lol.
Thank you, detaching the cable exited Fastboot and I could reboot normally. I was just worried it was unsafe.
You can also reboot the device from your PC while it’s still connected with the ‘fastboot reboot’ command. That’s a bit nicer than holding down multiple buttons etc.
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