Broken device after uninstalling King Root I uninstalled the King Root app after rooting my phone. Now my system isn't working correctly.

Symptoms:


When going in Settings->Storage it says "System Used : 16.00GB" (All my storage). I do not have an SD card and because of this I can't take pictures or download files.
When connecting my phone to my computer (Ubuntu 16.10) a folder pops up but it is empty.


I tried reinstalling KingRoot but I can't download the app since I have no storage space.

I'm willing to do anything (ex. reinstall os) if necessary. Please just explain how.

Phone model: BLU studio M HD

Thanks in advance
As @EthanZ said the factory reset solved the problem. Press the up volume key and power key when the device is powered of to get to the boot menu. Select Factory Reset. Done! Thanks EthanZ.