CyanogenMod 10.1 Nightlies are now available for the Samsung Galaxy S4 AT&T variant and you can use this post to learn how to successfully flash the custom ROM. Read the entire post first and don’t skip any steps that I have listed in the tutorial, as you wouldn’t want to repeat the installation multiple times before succeeding.
A custom ROM is a modified Android OS that brings new features and functions for a smartphone. This build of CM 10.1 Nightlies is based on 100% pure AOSP Android 4.2.2 Jelly Bean and, if you install it, you will get rid of all the AT&T / Samsung bloatware apps and data that is delivered with the stock device. You will get all the features in AOSP Jelly Bean along with multiple other small CyanogenMod-based features that should help you gain better accessibility and functionality our of your device.
In order to successfully flash this CM 10.1 Nightlies build for the AT&T Galaxy S3, read the preparation guide below first:
- use this tutorial only with the AT&T variant of the Samsung Galaxy S4 phone. The device should have the I337 model number, info that can be found under Settings > About phone menu.
- your smartphone has to be factory unlocked, rooted and running a custom Recovery image such as CWM or TWRP. I have used the ClockworkMod – CWM Recovery for this post, but you can use TWRP, if that’s the Recovery installed on your phone. The tutorial instructions are very similar and you will be able to complete the installation with TWRP, too.
- use the Custom Recovery mode and create a NANDROID backup of the currently installed ROM. It will set a restore point for your smartphone and you can use it in case the new ROM doesn’t want to boot with your phone.
- the tutorial contains a step that tells you to wipe data and factory reset the phone. This means that the contents of the system partition will be removed in the process. However, the contents of the internal SDcard won’t be changed by the process.
- you should still create some backups of your most important files, so that in case you lose some of them, you will still be able to restore them back to your phone.
- since the system partition will be wiped, you will lose SMS, call logs info and APN Internet settings, which is why you can the following tools for Android to backup some data: SMS backup & restore | Call Logs backup & restore | APN Settings Backup & Restore. Root access is required for some of these tools.
- if you want to backup installed apps data, then you can head to Google Play Store and search for such tools.
- sync all your Contacts data with the Gmail account that you’ve assigned as default for your smartphone.
- enable the USB Debugging option from Android Developer Options.
- make sure that there is enough power left in your phone’s battery before getting to the tutorial. The device shouldn’t switch off accidentally while you’re trying to flash the CM 10.1 Nightlies build.
- this is a guide for advanced users and you shouldn’t attempt to use this tutorial in case you don’t know what you’re doing.
- note that we cannot be held responsible in case you lose data or you brick the phone.
- don’t skip any steps listed below and make sure to read the entire post before starting to apply any changes.
These were all the instructions that you had to go over before continuing to the next part of this post.
NOTE: if your device is already running on a previous build of CM 10.1 Nightly build, then you can skip the ‘factory reset’ step and flash the new ROM build over it. This is also known as a ‘dirty flash’. In case you can’t complete the update, then you should ask for extra help in comments.
How to install CM 10.1 Nightly build ROM for the AT&T Galaxy S4 I337:
- Download the latest CM 10.1 Nightly build file from HERE. Get the latest edition and save the file on your PC. Don’t unzip the file.
- Download Gapps for Android 4.2.2 ROMs from HERE. Don’t unzip the file, just save it on your computer.
- Connect your phone to PC via USB cable when the files have been successfully downloaded.
- Move both files onto your device’s internal SDcard. Don’t unzip. Disconnect the phone from computer when all the files are copied successfully.
- Power off your device now.
- Boot your device into CWM Recovery like this: press and hold Volume Up, Home and Power buttons all at the same time. Release the buttons when the screen flickers or the Recovery mode appears.
- Select ‘backup and restore’ option from the main Recovery menu. Create a NANDROID backup of your current OS so that you’ll have a restore point for your device.
- Select ‘wipe data/ factory reset’ and confirm. NOTE: if your device is running on a previous CM 10.1 Nightly build, then you can skip this step.
- Return to the CWM Recovery menu and select ‘install zip from sdcard’.
- Select ‘choose zip from sdcard’ and find the CM 10.1 Nightly zip file and confirm.
- After the ROM is installed, select once again ‘choose zip from SDcard’ and find the Gapps file. Confirm its installation.
- When both files have been successfully installed you can return to the CWM Recovery main menu.
- Select ‘reboot system now’ and wait for the first boot process to complete for the Android 4.2.2-based CM 10.1 home screen to load.
- Enter your Google Account details and take control over your device.
- Test all the new features and customize its UI to improve your Android experience.
These were all the steps that you had to take in order to successfully flash this new custom ROM for your device.
NOTE: if the first boot process takes too long to complete, or the phone enters into a bootloop, it freezes or it doesn’t power ON, then you will have to remove its battery. Re-insert the battery after 5 seconds have passed and then boot into Recovery mode again. This time you should apply all steps including the Factory Reset one. Custom ROMs are usually acting up and might not install at the first attempt.
If you don’t like how this new CyanogenMod 10.1 Nightly OS works with your phone, then you can restore the backup of your previously installed ROM. For any other questions, please post them in our comments section.