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How to Unlock Bootloader, Install TWRP Recovery, and Root OnePlus 3T Unlock Bootloader
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Then go back to Settings> Developer options and enable USB Debugging and OEM unlocking.
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How to Unlock Bootloader, Install TWRP Recovery, and Root OnePlus 3T Unlock Bootloader
Then go back to Settings> Developer options and enable USB Debugging and OEM unlocking.