Solved: Fastboot Flashing Unlock is not allowed

If you try to unlock the fastboot flashing during the development using command,

$ sudo fastboot flashing unlock

You may get an error as,

FAILED (remote: 'Flashing Unlock is not allowed')
fastboot: error: Command failed

Solution :

This error can be solved by enabling “OEM Unlock” from developer settings.

Enable Developer options.

Then visit “Settings -> System -> Developer Options” and enable “OEM unlocking”

Note : This will work only on development platforms and Android devices available in consumer market may have “oem unlocking” disabled.