Galaxy S3 CM13 (CyanogenMod 13) Marshmallow ROM for GT-i9300

Galaxy S3 ROM CM13 Marshmallow for GT-i9300 is based on Android Marshmallow 6.0 is brought to you by DarkenedSky94. Current status of this build is not known at this moment.

It is strongly recommended that you take a NANDROID backup before flashing this ROM. Including this CM13 ROM here we have an UNOFFICIAL CM14 for S3 and an OFFICIAL CM14 Nougat ROM for Galaxy S3.

For more CM13 ROM updates and OFFICIAL update of Galaxy S3 CM13, you can have a look on the big CyanogenMod 13 devices list.

CAUTION:
Installing custom ROM requires a custom recovery to be installed on your device, which may VOID your warranty and may delete all your data. Before proceeding further you may consider backup your all data. You are the only person doing changes to your phone and I cannot be held responsible for the mistakes done by you. Neither the developer nor we will be held responsible for any disaster that happens to your device.

Files needed for Galaxy S3 CM13 Marshmallow ROM flashing:

- ROM download link for Galaxy S3 (GT-i9300) by DarkenedSky94
- Official ROM download link for Galaxy S3 (GT-i9300)
- CM13 Marshmallow Google Apps download link
- TWRP recovery download link for Galaxy S3 (GT-i9300).
  Here is How to Install TWRP on Samsung using Fastboot for the .img TWRP file.
  Here is How to Install TWRP on Samsung using Odin for the .tar TWRP file.

The CyanogenMod 13 ROM for Galaxy S3 comes with inbuilt ROOT, so SuperSU zip file is not required. After this CM13 installation you may want to enable ROOT access on your phone and here is how you can do that:
How to Enable ROOT Access on CM13/CyanogenMod 13

If required:
– The 15 seconds adb installer and the minimal adb and fastboot for Windows
ADB Fastboot Installation guide for Linux and MAC

Galaxy S3 CM13 (CyanogenMod 13) Marshmallow ROM flashing guide:

Make sure that you have a custom recovery installed on your Galaxy S3. If not then download the recovery from above downloads section and you can follow this TWRP recovery installation on Samsung phone using ODIN guide.

Follow this if you are flashing CyanogenMod 13 ROM for the first time to your Galaxy S3 phone, or coming from another ROM:
Points to NOTE on BACKUP:
– Try to avoid restoring apps backup using Titanium Backup. It may break things up.
– Don’t restore system data using Titanium Backup! It will definitely break the current installation.
– It is also discouraged to Restoring Apps + Data using Titanium Backup.
This installation may delete all your data on your phone. You may consider backing up your phone data or take a nandroid backup. Here is how to take NANDROID backup using TWRP recovery.
- Download and Copy the GApps and Galaxy S3 CyanogenMod 13 ROM ZIP to your phone.
- Take a backup using a synchronization application or using Samsung Smart Switch or if you have TWRP installed then boot into TWRP recovery and take a NANDROID backup using the TWRP itself.
- Reboot the Galaxy S3 into recovery mode (Hole Volume UP + HOME + Power button while the phone is booting). Make sure to have a Custom recovery like CWM or TWRP or any other custom recovery.
- Wipe data factory reset, Cache partition, Dalvik Cache and Format the System partition.
  – Here is a guide explaining how to wipe data using TWRP recovery.This will delete all your data on your phone. You may consider complete backup of your phone data or take a NANDROID backup of the current ROM.
  – How to backup all data on your Android Device.
  – how to take NANDROID backup using TWRP recovery.
- First flash the CM13 ROM ZIP from device. Then flash the GApps zip from your device memory.
  – Here is a post explaining how to flash a custom ROM using TWRP recovery.
  – Use the same guide to flash the GApps too.
- Reboot and Enjoy the CyanogenMod 13 Marshmallow ROM on your Galaxy S3.
Upgrading from earlier version of CyanogenMod 13 ROM on Galaxy S3 i9300:
- Copy the latest Galaxy S3 CyanogenMod 13 ROM ZIP file to your phone.
- Boot into Recovery.
- Flash the latest CM ROM ZIP from your phone.
  – Here is a post explaining how to flash a custom ROM using TWRP recovery.
  – Use the same guide to flash the GApps too.
- Reboot and Enjoy

Complete the initial setup and enjoy Android Marshmallow 6.0.1 with CyanogenMod 13 for Galaxy S3 i9300. After this CM13 installation you may want to enable ROOT access on your phone and here is how you can do that:
How to Enable ROOT Access on CM13/CyanogenMod 13

Stay tuned or Subscribe to the Galaxy S3 forum For upcoming Android Nougat ROMs, CyanogenMod Custom ROMs, other ROMs and all other device specific topics.

If you have any concerns to convey or BUGs to fire then here is the forum discussion thread for this ROM.