Updating your mobile device to Android Kitkat 4.4 is not recommended due to the new External SD Card Write Restriction imposed by Google, the developers of the Android Operating System.
references
- http://blog.b1.org/sandbox-an-easier-work-with-sd-card-in-kitkat/
- https://play.google.com/store/apps/details?id=com.geeksoft.extcardpatch&hl=en