The ASUS ZenFone 2 bootloader has been unofficially unlocked, but folks should still proceed with caution before attempting to unlock their device.
One of the great things about Android is just how customizable it is, and the doors open even further when people can start messing around with custom ROMs and kernels. This level of customization is not for everyone, but those who enjoy tinkering with their device will be pleased to see the bootloader unlock for the ZenFone 2.
Source: iMore