How to Install AOSP Android 5.1.1 Lollipop on Samsung Galaxy S3

Android 6.0 Marshmallow is just around the corner and with it comes the hope of better battery management among other performance improvements and under the hood optimizations. However, until that happens, we would have to rely on Android 5.1.1 Lollipop. The list of Android 5.1.1 custom ROMs has taken longer to build up and is now finally starting to see some popular names and stable custom firmware. Adding to this list is AOSP Android 5.1.1 Lollipop custom ROM.

AOSP is one of the most popular custom firmwares loved for it is the closest to the stock Android look and feel. Bringing stability and improved performance, you can now flash AOSP Android 5.1.1 Lollipop on your Samsung Galaxy S3 I9300. As with all the custom ROMs, this too is not an official release by Samsung, but just a custom ROM which would require a custom recovery like ClockworkMod to flash the ROM zip file on your phone. Follow this guide to flash AOSP Android 5.1.1 Lollipop your Galaxy S3.

Prerequisites to install AOSP Android 5.1.1 Lollipop on Galaxy S3:

  • Create a backup of all important data in your Galaxy device.
  • Download and install USB drivers for Samsung Galaxy S3 in your computer.
  • Enable USB debugging option by pressing Menu > Settings > Applications. Navigate and tap on Developer Options to ensure that USB Debugging is enabled.
  • Make sure that recovery tool like ClockworkMod recovery is installed.
  • Ensure that your Samsung Galaxy S3 i9300 carries more than 80% of charge. 

How to install AOSP Android 5.1.1 Lollipop on Samsung Galaxy S3:

Files required: download AOSP Android 5.1.1 Lollipop custom ROM;  also download Google Apps. Save both files on PC.

Here are the steps to update Galaxy S3 i9300 to AOSP Android 5.1.1 Lollipop custom ROM:

  • Connect your Samsung Galaxy S3 I9300 to your computer using USB cable and copy the downloaded files to the SD card of your Galaxy device.
  • Disconnect the connection with PC and turn your Galaxy S3 off.
  • Boot into custom recovery mode: press and hold Volume Up, Down and the Power buttons simultaneously until Samsung logo shows up. Leave the keys for half a second and hold again. Use Volume keys to scroll and Power button to select - alternatively you can use Quick Boot app to reboot your Android device in recovery mode.
  • Now perform Nandroid backup of your current ROM: select Backup and Restore Backup. Go back to main recovery menu after backup process is done - very important step to restore back to current OS.
  • Data wiping tasks: select wipe data/factory reset Yes. It will take a few minutes; once done, select wipe cache partition. Next tap on Advance wipe Dalvik Cache to wipe Dalvik cache data too.
  • Select install zip from sdcard followed by choose zip from sdcard. Locate the Android 5.1.1 based custom ROM file copied earlier and select it. Tap on yes to confirm installation and wait for the ROM installation to be completed.
  • Once installation process is finished successfully, repeat the above step, but choose GApps file instead to install the Google apps package on your SGS3 I9300.
  • Return to main recovery menu now and select reboot system now to boot up into the latest Android 5.1.1 Lollipop custom firmware for Samsung Galaxy S3. It will take a bit of time during the first boot, so kindly be patient.
  • Ta da! Enjoy Lollipop on Galaxy S3.

How to restore: If you want to return to previous OS on your SGS3, boot into recovery, select backup and restore then restore your previous ROM by selecting it from the list.

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