Hello,
I tried to update my Xperia-X with new sailfish x software version, but I put the on/off button by mistake. After that, the phone stucks on Sony-Logo when booting up.
I tried to flash sailfish x again, but my Computer says, no fastboot device is connected.
Can anyone help me please?
Just a suggestion: Booting with Volume up again? See the section 4.3 on recovery mode here:
Did you reboot your computer?
thx for your reply!
I rebooted PC again and after that I tried to enter fastboot mode (Volume up, then connection to pc) → blue light on phone is on, but the PC doesn’t recognices any phone or fstboot device 
In my device manager, it says “the device cannot be started”. Drivers are installed properly. Maybe my phone is bricked permanently?
Ok, I solved it. I tell, how it worked, in case other users have the same problem:
- Download Xperia Companion from sony homepage
- Install it, let it install ANY drivers
- the PC now recognises the phone in fastboot mode.
- flashing sailfish x
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Congrats. Have fun with your device.