How to factory reset the OnePlus 2 (settings menu)

• Backup your data by going to Settings > Backup & reset > Back up my data > On.
• Select the Google account where you want to back up your data.
• Go to Settings > Backup & reset > Reset phone > Erase everything.
• Wait for your OnePlus 2 to reset to factory default settings and restart it automatically.

How to factory reset the OnePlus 2 (hardware buttons)

• Press the power key of your OnePlus 2 and select Power off or keep the key pressed down for a few seconds.
• Wait a few seconds, then press and hold the power and volume up keys together.
• Once you see fastboot mode, release the keys.
• Select your language and then tap Wipe data and cache > Data and cache will be wiped, continue?
• Select yes and wait while your phone wipes its data and cached folders.
• Once completed, your display will read 'Wipe success' and give you the option of rebooting your phone or going back.
• Choose reboot and your OnePlus 2 will be in its factory-fresh state.