How to install custom ROM on Android Phone [Samsung Galaxy Grand]?

This post explains how to install custom ROM GENNXT I9082OFFICIAL4.2.2 on Samsung Galaxy Grand. The process of installing custom ROM on Android Phones practically the same except a few differences here and there based on hardware and software differences.


Advantages of installing custom ROM: 

The stock ROM that comes with the phone has lot of bloatware (unnecessary applications) such as Google Play Movies, Google Play Music, ChatOn, and other Google and Samsung applications that you will hardly or never use. They are just lying there and consuming space and RAM. A custom ROM will not include these applications.

There are risks of rooting your phone such as voiding warranty and if something goes wrong, your phone might get bricked. Consider these risks and proceed if you must.

Pr-Requisites:
Before installing custom ROM, the phone should have Clockworkmod Recovery installed and the phone should be rooted. See this post how to install Clockworkmod Recovery and root the phone.

After installing Clockworkmod and rooting the phones as per the steps shown in the link (above), come back here to install custom ROM as per the steps below.
 
Backup the stock ROM: 
It is highly recommended that you backup your stock ROM before installing custom ROM. To back up your stock ROM you may install ROM Manager and do it.

ROM MANAGER: Download and install ROM Manager from Google Play (Download Link).

With ROM Manager, you can:

• Boot into recovery mode from ROM Manager directly to install apps in zip file
• Backup your current stock ROM to SD card

Or you can also backup your stock ROM from Clockworkmod Recovery.

• Boot into RECOVERY MODE by pressing VOLUME UP+HOME+POWER button simultaneously and home.
• Navigate to “BACKUP” > “BACKUP TO EXTERNAL SD CARD” by using VOLUEM UP AND DOWN buttons to navigate and POWER BUTTON to select a menu item.

INSTALLING CUSTOM ROM ON SAMSUNG GALAXY GRAND

• Required files:
  • Download the GENNXT I9082OFFICIAL Android 4.2.2 custom ROM from here.
  • Download Google Apps here.
  • And make sure you have the custom ROM zip file in your external SD Card. If not, place it in the external Card.
• Boot into Recovery Mode. To start in Recovery Mode, do this:
  • Switch ON your device by simultaneously pressing Volume Up + Home + Power keys together.
  • Navigate to “install zip from SD card” >> “choose zip from external sdcard”.
    • Navigate using the volume up and down buttons.
    • Select using the power button
    • Select the zip file stored on the external sd card - GENNXT I9082OFFICIAL ROM
• After installation is completed, install Google Apps by following the same procedure.
• Reboot by selecting the “reboot system now” option in the main recovery menu.

That’s all!
You should now have a new custom ROM on your Samsung Galaxy Grand I9082.