FOR SDFIX here's what is written on Google Play:
*** REQUIRES ROOT ACCESS ***
Android 4.4 KitKat removes your ability to write files to the MicroSD card (on phones/tablets that have both internal memory and user-installed MicroSD cards). NextApp SDFix restores this ability by modifying a configuration file. As this app changes a system configuration file, it requires root access.
WARNING! PLEASE READ BEFORE INSTALLING:
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* THIS APP REQUIRES ROOT ACCESS. IF YOU DO NOT KNOW WHAT THIS MEANS, PLEASE DO NOT INSTALL THE APP.
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