How do you reset to factory default on a passcode locked Smartisan T1?

To reset a passcode-locked Smartisan T1 to factory settings, you'll need to perform a hard reset. Power off the device, then press and hold the Volume Up and Power buttons simultaneously until the Smartisan logo appears. Release the buttons, and navigate to the "Wipe data/factory reset" option using the volume buttons, then confirm with the Power button. This will erase all data on the device, including the passcode.