Commands for unlocking bootloader

There are different fastboot command based for smartphones.

But now for unlocking the bootloader means, oem unlocking  fastboot command is being used.
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Open command window (cmd) >

Connect mobile on bootloader mode >

run command: fastboot devices >

Your model will display there if, okay then >

run command for unlocking: fastboot oem unlock >

run command: fastboot reboot for system rebooting.

Here, your smartphone will restarted on unlocked bootloader mode...