magicxavi

1 - Boot your device into fastboot mode:
      adb reboot bootloader     (or power off and power on again
      while pressing Power + Vol Down)
2 - Flash LineageOS recovery via fastboot
      fastboot flash boot <name of the file>
3 - Reboot to recovery
4 - Perform factory reset (formatting data is important)
5 - Here you have 2 choices to install rom
      1) Apply update > apply from ADB
          on PC open terminal and type - adb sideload <rom zip name>