How to Install CM10.1 android 4.2.1 Jelly Bean ROM on Samsung Galaxy S3 I9300

In this tutorial we will guide you step-by-step on how to install CM10.1 Android 4.2.1 Jelly Bean ROM on Samsung Galaxy S3 I9300.
CyanogenMod 10.1 Android v4.2.1 Jelly Bean provides an immense exhilaration to those by Samsung Galaxy S3 I9300 users desiring to enjoy the features of Jelly Bean 4.2.1 ROM. CyanogenMod, also known as simply CM, is undoubtedly the most greatly acknowledged unauthorized Android firmware, and day-by-day they are increasing their compatibility with numerous old and freshly arriving Android devices from different manufacturers., including our Samsung Galaxy S3 I9300. Many reviews show that CyanogenMod provides much more facilities than the official Android firmware. Installing CyanogenMod 10.1 Android 4.2.1 Jelly Bean on your Samsung Galaxy S3 I9300 will enable its user to sustain in the Jelly Bean environment.
So in this tutorial we will be showing you an installation guide regarding using CyanogenMod 10.1 Jelly Bean 4.2.1 ROM on Samsung Galaxy S3 I9300. Just follow the simple steps given below:


This tutorial will definitely work when using Samsung Galaxy S3 I9300 only. While working of it on others is not yet confirmed. On applying this installation to another model or device may give an unwanted result. While applying this update we will not be responsible if anything occurs to your device, so continue at your own risk.


  1. For successful completion of this rooting process charge your phone up to a minimum of 75% battery.
  2. You must take a back-up of all your personnel items and other impotent data, such as Call Logs, SMS, Contacts, Audios, Images, Videos, APN (Access Point Names) settings, Bookmarks, MMS settings, on your phone.
  3. One must install a custom recovery image particularly for his Android device. To do this, ClockworkMod Recovery should be downloaded using the Internet.
  4. If you have not, then you must unlock your Android device’s Bootloader. But due to unlocking of Bootloader, your Android device may lose its official Warranty. So to overcome this, download fastboot from Internet.

Steps for installing CM10.1 Android 4.2.1 Jelly Bean ROM on Samsung Galaxy S3 I9300

Step 1
From your Android device disconnect & remove the memory card and insert it in your Computer using a card reader. You must not use USB cable, since CyanogenMod do not work properly through USBs.
Step 2
Now do repartition of memory card, by just doing right click on the existing partition, choose Resize option, and then apply the sufficient amount of space towards your new partition. Make your new partition as your primary partition of Ext4 file system. Press the Apply option & remove your memory card now.
Step 3
Using the Internet, download: CM10.1 Android 4.2.1 Jelly Bean ROM for Samsung Galaxy S3 file and Google Apps in your Computer. Again reinsert it in the PC and then copy the above downloaded zip file in a folder named as “root” under your SD Card. Don’t run or try to open this file, just copy it in the folder.
Step 4
Now, remove your memory card from the Computer. Then shut-down your Android smartphone and then again insert back memory card in the phone.
Step 5
Now, enter into the Recovery Mode. For this just press the Down Volume & Home button simultaneously, and while pressing these buttons press down your Power button at the same time.
Step 6
Since you are now in the Recovery Mode, select the install zip from SD card” option, and then select the choose zip from SD card” option to browse into your SD Card. Now, navigate up to the downloaded CM10.1 Android 4.2.1 Jelly Bean ROM for Samsung Galaxy S3” file for flashing it on your phone.
Step 7
Now get yourself back to the main menu by pressing back button and then reboot your Android phone.
Step 8
After this, you’ll have CyanogenMod 10.1 ROM installed over your Samsung Galaxy S3 I9300.

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