Toggle the switch to "enable OEM unlocking"
Go back to the main settings page, go to system and then developer options (it might be hiding behind a drop down). Open setting, go to "About" and tap on the "build number" box ~10 times until you get a message saying you are now a developer. If your device is not carrier locked, the following is all that's needed to unlock the bootloader: You will need a windows PC, qualcomm usb drivers and use EDL mode. Alternatively if you can't get the unlock code, or don't want to wait, you can use MSMDownloadTool to fully reflash device internal storage to old stock international ROM, where fastboot doesn't require unlock codes: this guide from XDA should help. For the T-mobile version of the device in the US, refer to Google for guides on obtaining an unlock code. Once you feel the device power on, continue holding Volume Up + Volume Down until you reach Fastboot Mode.īefore installing postmarketOS you have to unlock your bootloader. With the device unplugged and powered off, hold Volume Up + Volume Down + Power. You can also use Volume Up + Volume Down to select an action from the menu at the top of the screen, and Power to select the action which include powering off the device, continuing booting to the operating system, and restarting the bootloader which is useful if Fastboot commands are failing. 
While in Fastboot Mode you can use a computer to issue Fastboot commands to flash firmware to the device and manage the current slot that the bootloader is using to boot the operating system. When you access Fastboot Mode, you can view information about the SoC and whether the bootloader (DEVICE STATE) is locked or unlocked. a slightly different screen resolution.It shares almost all hardware with the OnePlus 6 (non-T), with the following differences:
3.1 postmarketOS users that own the device.
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