Hi @sony,
@sony said in Xperia X can not open bootloader:
@MrT10001 Yes, we unlocked bootloader and we have status ,,unlocked''
It is not apparent to us where you read the status "unlocked" from, because further down in the post you write you don't know if you are in fastboot mode.
What does your device show, check the status via the bootloader, similar to the picture
dc390d95-668d-492e-a18b-1d422a58ce1c-grafik.png
The error message, of the Ubports installer, is strange if the bootloader jam would be "unlocked".
And please give us more info about what you have already done, and in what order. Or are you just waiting for us?
Greetings Mario