Flashing new updated firmware will delete all your data from phone storage, so, it is good and great idea to backup your all personal data including contacts, messages and media files to your SD card, Computer or any cloud storage like Google drive and Dropbox. You can always restore your data to your phone after successful flashing.
Samsung Galaxy Note 5 Duos Sm-n9208 Marshmallow Firmware Download
From time to time samsung provides official firmware updates with improved features. Samsung recently rolled out Android 6.1.1 firmware update for its variant Note S 5 Duos SM-n9208. In this page you will find download link to Samsung Galaxy Note 5 Duos Sm-n9208 Marshmallow update. You can download it using link we have provided below and then flash it on your device. Below are the firmware flashing guide and download link for Samsung Galaxy Note 5 Duos Sm-n9208 Marshmallow.
Firmware Flashing with ODIN Tool
Extract (unzip) the firmware file
Download Odin3 v3.12.3
Extract Odin ZIP file, you will get Odin v3.12.3 executable. Open it.
Reboot Phone in Download Mode (press and hold Home + Power + Volume Down buttons)
Connect phone and wait until you get a blue sign in Odin
Add the firmware file to AP / PDA
Make sure re-partition is NOT ticked
Click the start button, sit back and wait few minutes
Now download the latest firmware update based on Android 6.1.1 for Samsung Galaxy Note 5 Duos Sm-n9208. Here we have provided safe and secure download links. Get Marshmallow Firmware