The Samsung Galaxy Note 3 which was released September 2013 came preloaded with Android 4.3 Jelly Bean. And, users can update the phablet to Android 5.0 officially but for those that wanted to flash Android 5.1.1 on their Samsung Galaxy Note 3, they we are good to go using Phrenosis new firmware.
The new Phronesis Android 5.1.1 firmware for Samsung Galaxy Note 3 is a huge file. The update weighs 1.3GB.
It is not out of range that Android 5.1.1 update enhance device performance and improve battery life. In the same sense, it helps to fix vulnerability.
Caution must be taken when installing this Android 5.1.1 on your Samsung Galaxy Note 3 since the update is not the official release from Samsung itself as this might bridges the warranty of the device.
The core criterial for installing Android 5.1.1 on Samsung Galaxy Note 3 is that the Note 3 model must be the exact one. That is, the exact Samsung Galaxy Note 3 model must be SM-N9005 according to the source of the firmware (Phronesis).
To check your Samsung Galaxy Note 3 model, go to settings–>About phone–> phone model and you will find your phone model number.
Alos, try to install any of this recovery tools on your Samsung Galaxy Note 3 to help back up your device.
ClockWorkMod Recovery or CWM and the TeamWin Recovery Project or TWRP.
Connect your Samsung Galaxy Note 3 to your PC using USB cable and copy the two files to your microSD.
Disconnect your phone from your PC and power it off. Turn on your Samsung Galaxy Note 3 into recovery mode.
Delete the Note 3 memory by clicking on wipe cache partition
Go back to the recovery mode home screen and select Phronesis Android 5.1.1 custom ROM from your memory card and install it (Zip format).
After successful installation of the Android 5.1.1 custom ROM, click on reboot now from the recovery mode screen and that is all.
You have successfully Installed Android 5.1.1 to your Samsung Galaxy Note 3.