I tried to unlock boot loader for my phone, but didn't succeed.
I use mx-linux. I have installed adb and fastboot.
Adb detects the device, fastboot not.
When I use command: "adb reboot bootloader" the phone just reboot normaly. But I can manually go in bootloader mode via volume up + power-button.
There I can use "adb sideload" to sideload packages.
The command "adb reboot edl" reboot phone to some black screen. I can exit that mode via "adb reboot bootloader"
Additional I can boot via volume down + power-button to some test mode where a short message on black screen say, that this is a factory test mode. I can also exit from here via "adb reboot bootloader"
How can I unlock the bootloader, to bring lineageos to the phone?