The following post will take you through a comprehensive guide to update Galaxy S3 I9305 LTE to Android Marshmallow Custom ROMs including Resurrection Remix, CyanideL, CyanogenMod 13 and AICP ROM.
Galaxy S3 I9305 is the LTE variant of Samsung’s 2012 flagship device. Galaxy S3 was the device which gave Samsung the breakthrough that it needed to set its flagship lineup right. Samsung has been outdoing all other smartphone manufactures ever since it produced the Galaxy S3. Every single device that came after the Galaxy S3 was more successful than the S3. The S3 on the front had a 4.8-inch 720p display. It was powered up with Exynos 4412 Quad Core CPU and a RAM of 2 GB. The phone had 16 GB internal storage. 8 MP shooter at the back and a 2.1 MP shooter on the front. A 2100 mAh battery was packed inside and the phone ran on Android 4.1.1 Jelly Bean out of the box.
Galaxy S3’s official software support ended on Android 4.4.4 KitKat. Since then, Samsung never looked back and left the device all alone in the hands of custom ROM developers. Thankfully, the Galaxy S3 has been tasting all latest versions of Android which came out over the course of past 4 years. The new updates were made by means of custom ROMs. The recent iteration of Android, the Android 6.0.1 Marshmallow also made its way to the Galaxy S3 I9305 through various custom ROMs, and that’s what have for all of our beloved I9305 owners right here.
Before proceeding, we would like to let our users know that the ROMs we are going to cover are stable and are well tested by a huge number of users. These ROMs can be used as your daily driver. Having said that, since these are custom ROMs, we still can’t be sure of each and every single thing. Assuming that you are an Android power user(or going to be one if not right now) a few things crashing on your phone shouldn’t be a big deal. You can quickly revert back to your stock Android firmware if the custom ROMs do not fulfil your Android appetite.
- This guide is intended for Galaxy S3 GT-I9305 users. Do not try this on any other device. Using the files linked here on a different device can result in bricking it. Verify your device model number in your phone’s settings > about device section.
- Your device must be running the latest possible available version of Android.
- Charge your phone up to 50% to avoid any power issues during the flashing process.
- Flash a custom recovery like TWRP on your Galaxy S3 I9305.
- Backup everything including contacts, call logs, sms messages and bookmarks. Also copy your media content to your computer.
- Create a Nandroid backup. This is highly recommend so that in case something goes wrong, you will be able to restore your system immediately by restoring Nandroid backup.
- Create an EFS backup of your device as well. Save the EFS backup to some safe place in your computer.
- Backup your important apps and apps data using Titanium backup if you want.
- Follow this guide carefully.
DISCLAIMER:THE METHODS INVOLVED IN FLASHING CUSTOM RECOVERIES, ROMS AND ROOTING YOUR PHONE ARE HIGHLY CUSTOM AND MAY RESULT IN BRICKING YOUR DEVICE, AND HAS NOTHING TO DO WITH GOOGLE OR THE DEVICE MANUFACTURER THAT IS Samsung IN OUR CASE. ALSO ROOTING YOUR DEVICE WILL VOID ITS WARRANTY AND YOU WILL BE NO LONGER ELIGIBLE FOR ANY KIND OF FREE DEVICE SERVICES BY THE MANUFACTURERS/WARRANTY PROVIDERS. IN CASE OF ANY MISHAP WE MAY NOT BE HELD RESPONSIBLE.
Update Galaxy S3 I9305 to Android 6.0.1 Marshmallow Custom ROM
- Download the custom ROM of your choice:
- Download Gapps.zip (ARM 6.0.zip) file.
- Connect your phone to your PC now.
- Copy the both the .zip files to the storage of your phone.
- Now disconnect your phone and turn it off complete.
- Boot into TWRP recovery now, in order to do so, turn it on by pressing and holding Volume Up + Home Button + Power Key. You should see the recovery mode in a while.
- Now in TWRP recovery, wipe cache, factory data reset the device using the Wipe option.
- After wiping all these three, select “Install” option.
- Now after tapping install > Locate and select customrom……xxxxx.zip file > Swipe finger to confirm > flash the ROM”.
- This will flash the ROM in your phone, once done get back to the main menu in recovery.
- Now once again tap “Install > Locate and Select Gapps.zip file > Swipe finger to flash > flash Gapps.zip”.
- This will flash the Gapps in your phone.
- Reboot your device to system now.
- You should see the Android 6.0 Marshmallow running on your device in a while.
- That’s all!
First boot may take up to 10 minutes, you may not worry if it’s taking that much long. In case it’s taking too long, you may boot into TWRP recovery and wipe cache and dalvik cache and reboot your device as it may fix the issue. In case your device is having issues, you may return to your old system using the Nandroid backup or follow our guide here to install stock firmware.
Got any queries? Reach us out through the comment box below.