If you want to give your aging Samsung Galaxy Mega 6.3 a fresh make over you might want to install this new Galaxy S5 ROM on it. This will bring all the Samsung Galaxy S5 features on your Mega and the best part is that it works for both GT-i9200 and GT-i9205 which are 3G and LTE variants respectively.
Samsung Galaxy S5 features ported to Galaxy Mega 6.4 include S5 Launcher work, System UI, Music Player, Calendar & Widget, Video Player, S-Voice, Calculator, File Manager, Album 2014, App Messaging, Voice Recorder, Memo, Task Manager, Samusung Apps, Group Play, Bluetooth, Phone & Contacts, Keyboard, Emergency mode, Radio, Lockscreen w/ all effects, Popping colors, Light, Blind, Stone skipping, Watercolor, Oil, Paint & Ripple Effects, Gallery, Multiwindow, S Finder, Studio, Pop-Up caller, Kids Mode Installer, Vip Mode, Shutdown Menu and Car Mode. Here are the installation instructions:
1: Download ROM (link)
2: Reboot to PhilzTouch Recovery
3: Wipe Factory Reset Phone -> clean to install a New ROM
4: Install Zip -> install from sdcard/sdcard1 -> S5ROMforMEGAi9200_17Jan2014.zip and flash.
5: Reboot to recovery again.
6: Re-root system using Philz touch miscellaneous settings.
7: setup wizard comes up and proceed till you get to the home screen.
8: You will find the navigation bar. Do not disable it in build.prop instead follow step 9.
9: Install Xposd Framework apk (search it and download it from google), open the app, install framework. reboot.
10: Install GravityBox KK apk from the download section of xposd app. Install it. Enable it in modules. Restart
11: go to gravitybox app reduce the size of the navbar to like 0 or 1 .. prefered is 0 using the slider.
12 That will get rid of the navigation bar (this is important for the dialer) and wil stil have the overflow menu enabled everywhere.
13: download AppSettings from xposed app under download section and install it. enable it in the modules section. reboot.
14: open App settings app and look for contacts.
15: change the dpi from 0 to 320 and save (this is important for the phone dialer to become full screen)
16: thats pretty much you have to do. everythin else is present already in the ROM.
17: to explore the various features.. long press the notification toggle icons.. it ll open a new menu which is not present in the settings.
18: using xposd app you can download even floating windows to make windows float like note 4.