In order to hard reset a Danger Sidekick 3, you should perform the following steps.
Remember! Hard reset will delete all the data on your device; pictures, contacts, messages, apps and more.
Danger Sidekick 3 device will be brought back to the default configuration of a brand new device.
1. Remove the battery and SIM card from the device. Open the sidekick flip.
2. Press and hold R.
3. As you hold it, put the battery back in place. Allow the device to restart twice while STILL HOLDING R.
4. Remove the battery, put the SIM card back in and then put the battery back in. Done.