Although Galaxy Note 3 was a very successfully Flagship and a premium phablet, but it is never going to get Android 6 Marshmallow update officially from Samsung. That’s a bitter truth. But there use to be always an alternative. If you are a Note 3 user and want taste the Marshmallow, here is an Android 6.0.1 based Custom rom called Slim6. It is very light weight but complete marshmallow package for your phablet.
Slim6 ROM brings all features and security of Marshmallow to your Note 3. From Now on Tap to Doze Mode, every feature on your phone. It is just 247MB in size and takes about 10 minutes to get the device updated. You can follow the step by step Installation Guide here. However, you must have some experience before carrying out this process because it requires Rooting your Note 3 before you flash the ROM which itself needs some experience of Recovery Mode.
You just need to be good in following the process as mentioned. You you don’t, the phone may get bricked. That still not the problem because you can fix bricked phones easily. So, its been years since your Galaxy Note 3 is running on Android 5.1 Lollipop. The time has come to upgrade and give it the new taste of Marshmallow. Download the required files from below and get it done.