You can try multi things depending on the issue, there is a long drawn out method and there is a quick one, let me give you the quick one. With Smartview open and your device plugged in hold down the Shift key and hit 33RPR3, if nothing happens (some computers have special functions tied to the left shift key) then hold down the right shift key and try again, if no change close and reopen Smartview, if done correctly a box comes up asking for the MSL, you can contact Sprint to get this, do not lose nor give out this code, then once you enter the correct code hit OK then a Repair Wizard comes up, save and close any other programs, hit the Repair button, at the end it will try to send an email and if you have no default client setup on the PC it will ask to setup one, just cancel that as the email isn't required, it will reboot at the end and test again. IF it still doesn't work ensure your IE isn't in Offline Mode and run the Setup Wizard in IE to be on a Broadband connection that is always on. If still no change then contact Sprint tech support and let them know what you've done so far.
Check out a fun infographic that teaches you how to increase storage, enhance security, improve battery life and clean your device.