Even though an AOSP Android 6.0 Marshmallow ROM is already available for your Samsung Galaxy Grand Duos (follow the mentioned link if you want to read the full step by step guide) you can now choose a new Marshmallow alternative. No, it’s not an official firmware as you will still have to use a custom ROM software. Anyway, this time I am talking about an unofficial release of CyanogenMod.

So, yes, that’s right, thanks to those of xda-developers I can now show you how to update your Galaxy Grand Duos to Android 6.0 M with CM 13. So, what do you say, are you interested in trying out a new custom Marshmallow update for your device? This ROM is almost fully stable, so you can easily use it on a daily basis. According to those who have already flashed it, the CM 13 software runs on the Galaxy Grand Duos without major problems, smoothly and without lags – you have the official developer web page here, where you can check further details about this new Android 6.0 M update.

Now, if you want to try it out, you should know that the CM 13 ROM will work only in some conditions for your Grand Duos. If you are used with custom update operations then you must already know that I am talking about the usual pre requisites which implies:

The root access is required as an unlocked Android system must be already ensured if you want to replace the current Android system with a custom ROM such as the new CM 13 firmware. Then, the custom recovery image will be required on the Nandroid backup and on the actual flashing process as the Android 6.0 Marshmallow OS will be provided in form of a .zip file.

The Nandroid backup is more than recommended as after all you are dealing with an unofficial ROM that can run with lags, bugs and with other annoying software related issues. Thus, with the Nandroid backup you can make sure that you can anytime go back to stock without having to use another dedicated update operation.

As mentioned, a hard reset will be implied so you might end up in losing important data, info and accounts. So, before doing anything else you should save your contacts, call logs, texts, images, videos, audio files, market apps, internet settings, calendar info, saved passwords, EFS or IMEI / NVRAM data. Don’t panic, everything can be stored easily through dedicated backup and restore apps that can be downloaded from Google Play.

Your phone’s warranty will also get void if you decide to resume the guidelines from below. That’s happening because you are using a custom ROM, developed by third party devs, and not an official Android OS released by Google or by Samsung. Thus, starting from now if you will have problems with your Galaxy Grand Duos you will probably have to learn how to manually fix your bricked Android based device as taking it back to service will imply in paying for the technical assistance.

As for the CM 13 ROM, with this Android 6.0 Marshmallow OS installed, your Galaxy Grand Duos should run better and faster than before. The batter life should also last longer and everything while you will be able to enjoy an improved Android system. You will also be able to overclock or undervolt CPU frequencies, to remove bloatware and to optimize and customize much more.

Good; now for the actual update operation you will have to download some files, so you need to use a computer. Since security features might interfere with the download process, you should temporarily deactivate the antivirus software from your PC. Your phone and its USB cable must also be there as you will have to connect your devices at some point. In order to properly establish this connection, first, on your Duos you need to gain Developer Options and to check the USB Debugging option: so, go to “menu – settings – about phone” and tap several times on Built Number and then access the “menu – settings – developer options” path from where you will eventually find the USB Debugging option.

Don’t forget to charge your Galaxy Grand Duos before flashing the Android 6.0 Marshmallow CM 13 OS. It is important to plug in the charger especially if the power left is currently lower than 50% - else, your phone might get turned off, and bricked, while you try to resume the guidelines from below.

How to Install CM13 on Galaxy Grand Duos and update to Android 6.0 Marshmallow OS

  1. From this page you can download the CM 13 ROM, while from here you can get compatible Google Apps.
  2. Store these files on your computer first and then connect your smartphone with your PC via USB cable.
  3. Transfer the downloaded files on your smartphone and when done unplug the USB cord as the computer is no longer useful.
  4. Power off your smartphone completely – complete a proper shut down process.
  5. Next, enter recovery mode on your Galaxy Grand Duos.
  6. The recovery environment is extreme important as through the same you will first wipe the system of your phone.
  7. Basically, you have to select “wipe data factory reset”, “wipe cache partition” and “wipe dalvik cache”.
  8. Up next, from the same recovery environment select the “Install” option and just load the downloaded files.
  9. When done, resume the installation process by following on screen prompts.
  10. Finally, select “reboot system now” from main menu of recovery”.

There you have it. Now you know how to install the new Android 6.0 Marshmallow based CM 13 custom ROM on your Samsung Galaxy Grand Duos. Enjoy and stay close for further step by step guides.

rakesh kashyap · 3 years ago

please share ur experience anybody who update

steafan ujjwal · 3 years ago

Yes I did

Sameed · 3 years ago

how you did it?
can you share with steps
whenever i try to wipe cache my phones gets restarted
but when i try to wipe data it works fine though..
idk what to do

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