You can now perform Marshmallow For Note 3 N900 update though Google will no longer provide official updates for this device as there are some developers who provide the latest Android update for this device and share it so users can enjoy Marshmallow on their Samsung tablets. It is not official version of Galaxy Note 3 so first you need to root your device in order for you to be able to install latest Android version into your device. Make sure you follow these steps so you can perform installation smoothly and safely.
Marshmallow For Note 3 N900 Rooting Steps
Before updating Marshmallow For Note 3 N900, your need to root your device. Download SuperSU package and TWRP recovery file. Download and install Odin and Samsung KIES on your PC. Use KIES to install the device USB drivers on your computer. Connect your device to your computer and copy the SuperSU package into your device. Now disconnect the USB cable. Start Odin on your PC. Shut down your device and then enter download mode by holding the volume down, power, and home keys simultaneously for a few seconds. Connect your device with your computer once again. Choose PA on Odin menu and choose the TWRP recovery file. Push Start to start tool installation. Disconnect the USB cable. Start recovery mode. Choose Install zip from SD card option and search for the zip file in the SD card. Choose the SuperSU package and start installation. Choose reboot system now option.
Marshmallow For Note 3 N900 CM13 ROM Installation
Download the CM 13 ROM file and Google Apps package into your computer. Use USB data cable to connect your device and your PC. Copy both files to your device SD card and then disconnect the USB cable. Shut down your device and then enter the recovery mode. Choose wipe cache partition, wipe data factory reset and wipe Dalvik cache from the menu. In the recovery mode, choose Install and search for the CM13 Marshmallow For Note 3 N900 ROM file and then confirm Android Marshmallow flashing process. Also flash the Google Apps package. Wait for the process to finish and then choose Reboot to restart your device.
Enter Recovery Mode once again. Download the Quick Boot tool from the Google Play store for your device. Install the tool on your device. Start the tool and choose Recovery option from the menu. And then reboot. Now your device is running on the Marshmallow For Note 3 N900.