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WARNING! Master resetting your Lumia 640 will result in the deletion of all personal data stored on the phones internal memory, and all settings will be restored to factory values.
NOTE: To learn how you can back up and restore your data before commencing the master reset, follow this link for a full guide. Also keep in mind that content on the SD and SIM cards will not be affected by the factory reset.
Master Reset from the Settings Menu:
- From the Start screen, slide left
- Go to Settings
- Swipe down and tap about
- Tap reset your phone
- At the warning message, read the information and tap yes
- Tap yes again to confirm and proceed with the reset
Master Reset via Hardware Keys:
NOTE: If you are unable to reset your phone by following the method above, then you can try applying the factory reset from the recovery menu, by performing a combination of hardware key presses.
- Turn off the Lumia 640
- With the device powered down, press and hold Volume Down
- Press the Power button to turn on the phone. Once the phone vibrates, release the Power button but continue pressing Volume Down
- Once the exclamation mark appears on the screen, release Volume Down too
- From the menu, perform the following button press combination (Keep in mind that nothing will change on the screen while you enter the following sequence):
- Press Volume Up
- Press Volume Down
- Press Power
- Press Volume Down
- Your phone should now automatically reset. During this time you should see two gears rotating on the screen for about 5 minutes
Check for Software Updates:
NOTE: After master resetting your phone its recommended that you check if any software updates are available for download. To do so:
- Swipe the Start screen left and go to applications
- Tap Settings > About
- Tap More info
- You can check the Firmware version number and see if a newer software update is available. If it is, follow the on-screen prompts to download and apply it
› See More: Microsoft Lumia 640: Master Reset and Check for OS Updates
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