1. Wipe YouTube app 2. Uninstall YouTube app 3. Open file explorer that has root permission (i.e. es file explorer) 4. Navigate to /system/ (Make sure it's mounted as r/w) 5. Open build.prop 6. Change the line at ro.build.version.release=4.4.4 to ro.build.version.release=5.0 and save 7. Reboot device 8. Download and install this YouTube version https://www.dropbox.com/s/vm9ncnzyy7...0.1.5.apk?dl=0 9. Go to the play store and disable automatic updating of the YouTube app 10. Open YouTube app and select a video that supports 1440p 11. Pause the video and change the quality to 1440p 12. Close the video (just the video, not the app) 13. Select the video again 14. Enjoy