Crystal ROM firmware is easy,you just have to follow the simple steps given below and you can easily enjoy Kitkat 4.4.2 based Crystal ROM firmware on your Galaxy S3 I9003.
Before you do that, make a back of your phone data, for example: media,contacts,sms,etc.You can do it any way you like,but you should go with the manual method.
Make sure your Galaxy S3 I9300 has Root access, if not then first root your phone.
* Here are some guidelines that you should follow:
•Use this tutorial only on Galaxy S3 I9300,don’t try it on other device.
•Try this only on Rooted Galaxy S3 I9300.
•Read the entire tutorial before starting the root process.
•Go to Developer Option Menu and enable USB Debugging.
•Make sure your phone battery is fully charged.
*Most Important: We are not responsible in case you lost your data or end up with a bricked device.”Don’t blame us “
Now, lets see the important steps:
GUIDE FOR UPDATING GALAXY S3 I9300 WITH KITKAT 4.4.2 BASED CRYSTAL ROM FIRMWARE
1- First you have to download the Crystal ROM firmware.
2- If you are saving this file on your PC then just connect your phone using a USB cable any paste the file in the root directory, or you can download it directly to your phone internal SD card.
3- Now disconnect your Samsung Galaxy S3 from your PC and turn it off.
4-Now boot your device in Recovery Mode,you can enter Recovery Mode by pressing Home+power+Volume up button simultaneously.
5-In Recovery mode select Clear Data” and “Wipe Cache”,this will wipe all your data and the cache partition from your phone.
6-After that click on “install zip from sd card” and select the Crystal ROM firmware and hit install,this will take around 4-5 minutes.
7-Just “go back” and select “reboot in normal mode” to reboot your device in normal mode.Sit back and relax it will around 5 minutes.
That’s it you have successfully updated Galaxy S3 I9300 with Kitkat 4.4.2 based Crystal ROM firmware.If your device reboot again and again,simply tun it off and remove the battery and reinsert it and start your phone.
If you have any problem, or facing any problem feel free to ask me and don’t forget to share this with your friends.