Asus P535 - Manual (Page 120)

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This option allows you to restore the default factory settings.
To restore default settings:
1. Tap Start > Settings > Default Settings.
2. Input ‘1234’ in the Password field to confirm that you want to restore to default settings.
3. Tap Ok.
You can also restore the factory settings by pressing the UP button of the navigation key and
the reset button at the same time.
Restoring default factory settings
WARNING:
This option will delete all files stored in this device.