Using v3.0.4 of ES File Explorer and am rooted (stock ROM). When I select 'Root Explorer' I get a 'Test Failed. Can't use this feature on this phone.' SU access has been granted. I can explore the system files but can't modify anything. I tried rebooting, reloading the app and clearing data. Any ideas on how to get the 'Root Explorer' in ES to work on a rooted S4/Sprint?