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There are 2 options you can choose from for unlocking bootloader of your device. The official method is less complex but has other issues like data loss and 7 days waiting. The instant method has no such issues but you will get a 'dm-verity' error to fix that you will have to either press power button every time it comes or clean flash fastboot rom again which will eventually lead to loss of data. Guides and tools for both linked below