Need a hand?

A bootloader is the software that starts a device's operating system. A locked bootloader prevents a device from loading unauthorised software, and ensures only the official, unmodified OS can run. Unlocking the bootloader could put a device at risk.

• Open 'Settings' and tap 'Developer options'
• Look for the OEM unlocking toggle
• The position of the toggle will indicate whether the bootloader is locked

These steps may vary depending on the device manufacturer. Contact your manufacturer's help centre if you need additional support.

• Open 'Settings'
• Go to 'About phone' and select 'Software information'
• Tap 'Build number' seven times until you see confirmation that developer options have been enabled
• Return to 'Settings'. 'Developer options' should now be listed in the menu

These steps may vary depending on the device manufacturer. Contact your manufacturer's help centre if you need additional support.

Relocking an unlocked bootloader can be complicated. The steps vary depending on the device and manufacturer, and attempting it yourself can cause problems if it's done incorrectly.

For more technical details, check the official Android documentation.

If you're not sure how to safely relock the bootloader, contact your device manufacturer’s official help centre or the shop where you purchased the device for professional support.