Update Galaxy S3 Neo to Android 5.0.2 Lollipop with stable CM 12 ROM. This Galaxy S3 Neo smartphone which is a variant of the original Galaxy S3 launched in April 2014 April 2014 features 1.2 GHz quad core processor, 1.5 GB RAM, 16 GB internal storage and 8 megapixel camera. It was rolled out in various countries including India and Bangladesh. In this article we’ll discussing a detailed step by step guide on how to install the latest Android 5.0.2 Lollipop based stable CM 12 ROM on this smartphone. As you all know that this smartphone unfortunately will never get the official Android Lollipop update from Samsung. But if you still want to experience the Android L on your Galaxy S3 Neo then you can go for custom ROMs.

Recently, senior XDA member Rox released the famous and well known Cyanogenmod 12 custom ROM for the Samsung Galaxy S3 Neo. The most important thing is that this build is absolutely stable, fast and even improves the battery performance of your phone. You can enjoy and experience all the Android 5.0 Lollipop features with this ROM. The complete info of this ROM is given below. Have a look at it.

Galaxy S3 Neo Android 5 Lollipop CM 12 ROM screenshot 1Galaxy S3 Neo Android 5 Lollipop CM 12 ROM screenshot 2

CM 12 ROM Info:
  • ROM OS version: 5.0.x Lollipop
  • ROM Kernel: Linux 3.4.x
  • Based on: Cyanogenmod
  • Status: Stable
  • Created on: 24 December

If you are interested in flashing this latest Android 5.0.2 Lollipop based stable Cyanogenmod 12 ROM on your Galaxy S3 Neo then head on to our actual article given below.

Disclaimer:

Flashing this CM 12 custom ROM might brick your Galaxy S3 Neo. So I recommend you to perform all the steps given below at your own risk. If by any mistake your Galaxy S3 Neo gets bricked or damaged by following this guide then neither do I nor the CM developers will be held responsible for that. Although the chances that your device will get damaged are least.

Compatibility:

This Cyanogenmod 12 custom ROM must be flashed only and only on Samsung Galaxy S3 Neo having model number GT-I9300I or GT-I9301I . Do not flash this ROM on any other device except the one mentioned as it may brick your phone. Better check your device’s model number from Menu->Settings>About Phone.

Pre-Requisites:
  • Charge your Galaxy S3 Neo at least up to 60%. This is important so as to decrease the risk of interruption during the flashing process.
  • Backup all your phones data and settings including contacts, messages, call logs, memos etc. to your phones SD card or on your PC for more safety. Do not ignore this step as everything gets wiped in the last step of this procedure.
  • You need to backup EFS folder present in your phones system directory. This folder contains all your phones specific information such as the IMEI, wireless devices MAC addresses, product code, and much more. So a backup of this folder is essential. There is always a risk that this EFS folder might get corrupted. If so happened, your device will be completely useless & will no longer be recognized by your carrier. Refer our article to backup and restore EFS/IMEI data:
  1. How to backup and restore EFS/IMEI on Android Phones.
  • Make sure you have installed mobile specific drivers on your PC. This is recommended so as to recognize your Galaxy S3 Neo when connected via USB cable. You can install them by installing Samsung Kies or manually install them from the link given below:
  1. Download latest Samsung USB Drivers.
  • Make sure your Samsung Galaxy S3 Neo is rooted.
  • A custom recovery like Clockworkmod (CWM) or TWRP must be installed before proceeding further. You can install recovery from the given steps:

Step 1: Download this CWM recovery on your PC. Also download this Odin software.

Step 2: Launch the Odin Software on your PC. Then switch off your Galaxy S3 Neo completely.

Step 3: Then boot your phone into download mode. For that, press and hold Volume down key + Home button (middle button) + Power button till you see a warning message. Then leave all the three keys and just press the volume up button to land into download mode.

Step 4: Keeping the phone in download mode connect it to your PC. As soon as you connect it, you’ll see the ID:COM section in Odin is turned yellow. Also an Added message will appear in the message box window. This will confirm that the connection between PC and phone has been established successfully. If it’s not showing, then check that a proper device drivers are installed on your PC. You can install them via Samsung Kies or manually install them from the links given in Pre-Requisites.

Galaxy S3 Neo cwm recovery odin screenshot1

Step 5: Tick the Auto Reboot option and F.Reset option located on the Odin window.

Galaxy S3 Neo cwm recovery odin screenshot 2

Step 6: Now, tick against ‘PDA’ button and navigate to the downloaded recovery.tar.md5 file & select it.

Galaxy S3 Neo cwm recovery odin screenshot 3

Step 7: After completing everything as mentioned above, start the process by clicking on the Start button located on the Odin window.

Galaxy S3 Neo cwm recovery odin screenshot 4

Wait for a minute until the process completes successfully with a Pass message in Odin window.

That’s all! You’ve successfully installed the CWM recovery on your Samsung Galaxy S3 Neo. Now head on to the actual article on how to install Android 5.0 Lollipop CM 12 ROM on your S3 Neo.

Procedure to install Android 5.0 Lollipop on Galaxy S3 Neo:

Downloads:

  1. Download Android 5.0 Lollipop CM 12 ROM for Samsung Galaxy S3 Neo.
  1. Download Google Apps for Samsung Galaxy S3 Neo.

Procedure:

Step 1: Download both the zip package files in a specific folder on your PC. Do not extract them.

Step 2: Now connect your Galaxy S3 Neo to PC using USB cable, enable USB debugging mode and copy the downloaded files on your phones SD card.

Step 3: Then safely disconnect your phone from PC. Switch it off completely and boot into recovery mode. For that simultaneously keep pressing and holding Volume up+ Home button (middle button) + Power button till you enter recovery mode.

Note: Touch won’t work in recovery mode. So use Volume keys for navigating up and down and use Home button for selection.

The first thing you need to do after entering recovery mode is that take a complete backup of your current ROM that you are using. This backup is called as Nandroid backup and is the backup of your phones entire operating system & is always helpful during the failure while flashing process or during any problem with the ROM, then you can easily restore your saved previous ROM.

Refer our detailed article for taking Nandroid backup:

  1. How to take Nandroid Backup of any Android Phone with 8 simple methods.

Step 4: For taking a nandroid backup of your current ROM, use Volume keys and navigate to the ‘backup & restore’ option on the recovery mode itself and on the next screen select ‘backup’ option using Home button. This will make a complete nandroid backup and will be saved on your phones SD card. Refer screenshots.

Nandroid backup screenshot 1Nandroid backup screenshot 2

Step 5: Now wipe the data and cache partitions from your phones internal memory. For doing so, navigate to the ‘wipe data/factory reset’ option using volume keys. Select it using Home button. On the next screen press Yes option to start the wiping process. Similarly navigate to the ‘wipe cache partition’ option and select it to wipe the caches. Note that this step will clear entire data from your phones internal memory including contacts, messages, apps, memos, call logs etc. Thus a complete backup of everything must be done before applying this step (Refer Pre-requisites section).

CWM wipe data cache screenshot

Step 6: Return to the main menu and select the Advanced option located on the recovery mode itself. On the next screen select Reboot Recovery  option.

reboot recovery screenshot

Wait until you boot again into recovery.

Let’s move to the actual Android 5.0 Lollipop themed ROM flashing process.

Step 7: Use Volume keys and navigate to the ‘install zip from SD card’ option. Select it using Home button. Then on the next screen select ‘choose zip from SD card’ option. This will show you all the files and folders present on your external SD card. Use Volume keys and navigate to the Android 5.0 Lollipop CM 12 ROM which you’ve copied earlier. Select it using Home button. On the next screen select ‘Yes’ option to start the actual Android 5.0 Lollipop ROM flashing process. Wait for some time to complete it flashing process.

CWM recovery Screenshot

Step 8: Again wipe the data/cache partitions from the recovery. For doing so select ‘wipe data/factory reset’ option and ‘wipe cache partition’ option. This step is essential to solve the boot loop issue.

Step 9: Similarly flash the Google Apps package as you’ve flashed the ROM zip file. Just remember not to wipe data/cache after that.

Step 10: Everything completes here. Just reboot your Samsung Galaxy S3 Neo by selecting ‘reboot system now’ option from the recovery mode. The first boot takes more time to start than usual. But don’t worry after a couple of boots it’ll be normal.

reboot system screenshot

Note: If you want to restore back your previous Rom, then you can do that by going back to the recovery mode by pressing & holding Home Button (middle button) +  Power Button simultaneously and select ‘Backup and Restore’ option and then on next page select ‘Restore’ option. Select the ROM you want to restore.

If you want to return your Samsung Galaxy S3 Neo to Official Android 4.3 Jelly Bean firmware then refer our article:

  1. How to update Samsung Galaxy S3 Neo to Official Android 4.3 Jelly Bean I9300IDDUANE1 firmware.

Success

Hurray! Your Samsung Galaxy S3 Neo smartphone has been successfully flashed with the latest Android 5.0 Lollipop based Cyanogenmod 12 Custom ROM. You can verify this from Menu->Settings->About Phone. Enjoy this latest Android 5.0 Lollipop fully featured ROM on your S3 Neo. Do share your experience after using it. If you come across any trouble or problem while flashing this ROM then do inform me through the comments. I’ll try to help you out. Till then enjoy! 🙂

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