Hard resets are useful for repairing problems occurring with your Ericsson W850i. Perform a hard reset to restore your Ericsson W850i back to its factory condition to eliminate bugs, glitches or other issues present on your device. A hard reset will wipe out any data that did not come on the device. Back up any software, music, programs, contacts and other information you want to keep before performing the reset.
Navigate to your Settings menu icon and press a "Selection" key to open it.
Click the "General" tab.
Select "Reset All" from the list of options. An instructions prompt will appear.