How to Flash a Custom ROM on the Samsung Galaxy S3

How to Flash a Custom ROM on the Samsung Galaxy S3

A custom ROM is a custom version of Android for your device. After you have rooted your device and flashed a custom recovery on it, you can then use the recovery to flash a custom ROM. Thanks to a sizeable community of developers, there are a lot of these third-party ROMs to choose from (depending on the device) and each one is unique. Developers usually give you the latest version of Android in their ROM, their own custom themes, options, and a ton of other customization options and enhancements.

In this procedure, we’ll show you how to flash a custom ROM on your Samsung Galaxy S3 (International).

After flashing a custom ROM on Samsung Galaxy S3 (International), you’ll be able to: 

• Flash newer versions of Android that the manufacturer hasn’t provided yet.
• Utilize different UI skins or stock Android(HTC’s Sense UI, Samsung’s TouchWiz UI, LG Optimus UI).
• Increase performance
• Increase battery life
• More customization options than stock ROMs

Interested? Here’s how to flash a custom ROM on your Samsung Galaxy S3 :

1. Before You Begin

1. You must be rooted to do this tutorial. Head to my another article of How To Root tutorial & Root Your Device .
   
2. You must also have a custom recovery flashed on your device before doing this tutorial. Head to my article of How to flash a custom recovery (like CWM or TWRP) on Android find your device, and do the How to Flash a Custom Recovery tutorial listed for it there then return to this tutorial to continue.
   
   
   

   2. Choose a Custom ROM to Flash

   1. Head to ROM repository of Unlockr and choose your device.
   2. Choose a ROM of your liking.
   3. Click the download link in the ROM post to be taken to the developer’s page for that ROM.
   4. Search through the developer’s page for the download link for the latest version of that ROM (usually located in the first post in a forum or under Downloads).
   5. Save the ROM to your desktop of your computer.
   
   

   3. Flash the Custom ROM on your Samsung Galaxy S3

   1. Plug in your device to your PC using the USB cable.
   
   2. Copy the Custom ROM .zip file available on your desktop over to the root of your SD card.
   
   3. Once it’s been copied, unplug your device from your PC.
   
   4. Turn OFF your device.
   
   5. Turn it back on by holding down Volume Up, Home, and Power buttons together.
   
   6. Your device should reboot into recovery mode.
   In the recovery mode, the Volume buttons are used for navigation and the Power button to make a selection.
   
   7. Select Backup and Restore.
   
   8. Select Backup.
   
   9. Hit Yes when prompted and it should begin creating the backup of your device.
   
   10. Once the backup is created, head back to main menu by selecting Back.
   
   11. Select Wipe data/factory reset.
   
   12. Hit Yes when prompted and let it wipe off your device.
   
   13. Once done, select Back and you’ll be back to the main menu.
   
   14. Select install zip from sdcard followed by choose zip from sdcard.
   
   15. Navigate to the root of your SD card and choose the custom ROM .zip file you copied earlier to be flashed on your device.
   
   16. Select Yes when asked if you really wish to flash this custom ROM.
    
   17. It’ll start flashing the ROM on your device.
   
   18. Once the ROM has been flashed, select reboot system now and your device will reboot.
   
   19. You’re all done!
   
   H-M