Based on TouchWiz, Assassin custom firmware gives you all the KitKat features while being super fast and stable. Assassin Android 4.4.2 KitKat custom ROM is popular for providing best battery time; here is how you canupdate Galaxy Note 3 N900 to Android 4.4.2 KitKat based Assassin custom ROM.

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AssassinAndroid 4.4.2 features:
AssassinAndroid 4.4.2custom firmwarecomes with a plenty of new features.Here are a few of them:
Super FastSuper Powerful SystemSupreme Performance and Long Battery Life with new level of customization…Pluss the best battery saver kernel ever DevelopedAssassin Kernel
Note:This guideis only to flash AssassinAndroid 4.4.2 KitKat on Galaxy Note 3 model N900. Please do not try on any other Galaxy Note 3 variants.
Prerequisites to update Galaxy Note 3 N900 to Android 4.4.2 Assassing:
Backup any important datafrom your Samsung Galaxy Note 3as a complete wipe will be required during the flashing process.Enable USB debugging option on your device:Settings>DevelopmentOptions>USB debugging.Samsung Galaxy Note 3 N900must berooted, unlockedand installed with a recovery tool likeTWRPorCWM.Your device must be charged to at least 60% of power.
How to update Galaxy Note 3 N900 to Android 4.4.2 Assassin:
Required files: download Assassin Android 4.4.2 KitKatcustom firmware for Galaxy Note 3 N900fromhereand save it on your computer. Do not extract the contents. Also download the Google Apps Package for your Note 3fromhere.
ConnectGalaxyNote 3 N900to your computer using a USB cable and copy the zip file to your phone’s SD card.Disconnect the USB cord andpower off yourGalaxy Note 3.Boot it into recovery mode bypressing and holdingVolume Up+Home+Powerbuttons together.Perform aNandroid backupof your current OS:Backup>backup and restoreon ClockworkMod recovery.Wipe data task: from CWM recovery menu, selectwipe data / factory resetand confirm the process. Then go on towipe cache partitionandwipe dalvik cache.From recovery menu, selectinstall zip from sdcardfollowed bychoose zip from sdcard.Locate the AssassinAndroid 4.4.2 custom firmwareand confirm the flashing process.Once done, repeat the above step for installing Gapps on your smartphone.After installation is done successfully, return back to main recovery menu and reboot your Note 3 N900 into the new custom ROM. First boot takes a good 5 minutes so please be patient.
How to restore:If you want to return to previous OS on your Note 3, boot intorecovery, selectbackup and restorethen restore your previous ROM by selecting it from the list.
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