1. CONTACT / ADRESSBOOK (EXPORT ALL CONTACTS TO SDCARD)
You are downloading CM12.1 ROM for Samsung Galaxy S3 Android smartphone. This is a custom Android 5.1 ROM that will make your S3 super fast!
Click the Play Button to see video on YouTube or Click Here to Download High-Quality HD MP4 video to your Smartphone or Computer.
Want to experience Android 5.1 on your Galaxy S3 today? Even newer smartphones like Galaxy S6 and HTC One M9 don’t have Android 5.1 yet but you can already get it for your Galaxy S3 through CM12.1 ROM.
The CM12.1 ROM builds are available for all AT&T, T-Mobile, Sprint, Verizon, Canadian, and GT-i9300 Galaxy S3 models. Although these are unofficial builds compiled from CyanogenMod sources, they are actually pretty stable, I haven’t found a single bug yet so far.
Since the update from Android 5.0.2 to 5.1 wasn’t a complete overhaul of the OS, we suspect that has a lot to do with its stability as developers don’t have to start from scratch to make everything integrated/stable.
Overall, Android 5.1 is going to give you the most performance improvement over previous Android OS versions along with much improved battery life. If you can’t afford a new phone but you want to upgrade your phone for free, CM12.1 ROM may be the best way to do that so definitely give these builds a try and do let me know what you think!
(These unofficial builds are compiled from official Cyanogen sources, no bug found so far.)
You will find easy drop-down WiFi and bluetooth shortcuts, which is a new feature of Android 5.1.
With Android 5.1 CM12.1 ROM, you can specify exactly which apps can notify you and also set the priority for these notifications.
Have more than one user? Take advantage of Android 5.1 Lollipop multi-user feature.
Camera and camcorder work flawless and CM12.1 comes with rotating launcher.
Download CM12.1 ROM for Galaxy S3 AT&T SGH-i747, T-Mobile SGH-T999, and Canadian SGH-i747M
Download CM12.1 ROM for Galaxy S3 Sprint SPH-L710
Download CM12.1 ROM for Galaxy S3 Verizon SCH-i535
Download CM12.1 ROM for Galaxy S3 GT-i9300
Download Android 5.1 Gapps for CM12.1 (DO NOT USE older Gapps, you will FC!!!)
To install, reboot into recovery, make backup ROM, format /system, wipe data/factory reset, install ROM, install Gapps, and reboot.
If you have AT&T or Verizon S3 with locked bootloader (Android 4.3 or up) and using SafeStrap, YOU CANNOT INSTALL THIS ROM, SORRY!
First time installing a custom ROM? See How to Install Custom ROM on Galaxy S3!
Can’t find root? See How to Enable Root on CM12!
Credits – AT&T/T-Mobile/Canadian, Sprint, Verizon, GT-i9300 <— Please donate to the developers or hit the Thanks button on XDA if you like this ROM,thx!
Don’t have a car mount for your phone yet? Make your driving safer, check out Gel-Suction Car Mount, I highly recommended and mounts on any surface!
Need a new micro-SD card? Check out Fastest MicroSD Card Shootout, make sure to get a good micro-SD card!
HighOnAndroid Google+ Community <— If you like this post, please join HighOnAndroid Google+ Community Here, thx!
HighOnAndroid Facebook Page <— If you like this post, please Like Our Facebook Page Here, thx!
Need Help? Best way to reach me is on Twitter for the fastest response!
Tweet/Follow Me @Zedomax
I don’t use Hangouts app much btw but you can follow me on my Google+ for latest updates.
Have Facebook? Follow me on Facebook
Want to stay updated on latest Galaxy S3 Root news?
Sign up for our Galaxy Note 3 Root Newsletter here so you get ROM of the week and more!
Galaxy S3 Reference
You will need a rooted Galaxy S3 to install all ROM/kernels.
NOTE: PLEASE ONLY INSTALL ROMS INTENDED FOR YOUR VERSION OF GALAXY S3! Otherwise you WILL BRICK YOUR PHONE and I will not be responsible!
First time to rooting and custom ROMs? Please see our Galaxy S3 Root FAQ FIRST!
Note: T-Mobile Galaxy S3 ROMs are compatible with Canadian Wind, Mobilicity, and Videotron Galaxy S3s.
AT&T Galaxy S3 ROMs are compatible with Canadian Bell, Telus, and Sasktel Galaxy S3s.