Android Marshmallow based official CM13 custom ROM to update Barnes and Noble Nook tablet can be downloaded from the link provided in the description. The Nook Tablet is an e-Reader tablet just like the Kindle from Amazon. So, if you are one of the users of this Nook Tablet then you can update it to Android Marshmallow.
This official custom ROM not an official firmware update from Google, it it developed by famous aftermarket Android developer knows as CyanogenMod. The CyanogenMod ROMs are best when it comes to custom ROM. These ROM has good stability when compared to other ROM out there. It's a Nightly build of CM13, so if you like to update your device then you first need to root it and install a custom recovery on it. If you have already done with it, then you can go ahead flash the ROM right away.
Make sure to follow the steps carefully and correctly. If any damage happens to the device, we or the manufacturers do not take any responsibility.
Preparing Your Phone
- These instructions are strictly for Barnes & Noble Nook Tablet, so do not try it on any other device or you may brick your device.
- The Device should be fully charged.
- Install device USB drivers on your computer.
- Back up all the required data to some safe storage.
- Make a Nandroid backup of the current ROM so that you can restore it when required.
- Make sure the device boot-loader is unlocked.
- Root your device and install custom recovery on it if not done already.
- Enable USB debugging mode of your device. Go to Settings > Developer options > USB debugging mode.
Install Android based CM13 Custom ROM
- Download Android 6.0 Marshmallow based Official CM13 ROM from here.
- Download the Google App's for Android Marshmallow from here.
- Connect the device to computer and transfer the files to your phone root storage.
- Disconnect the device and turn it off completely.
- Reboot the device into Recovery mode, press and hold Volume Down + Home + Power key for few a seconds.
- When in recovery mode, tap on Wipe tab and select the options Cache, Data, Dalvik Cache, EFS Data/Partition.
- Now, confirm the wipe action by swiping the button at the bottom of the screen.
- Now, return to the main menu and tap on Install tab.
- Locate the ROM file stored on your device and select it.
- Swipe the button to flash the ROM file on your device.
- In the same way flash the Google App's on your device.
- Return to main menu and tap on Reboot.
- The System will now reboot in normal mode.
That's all you can now check the device Android version in Settings > About device > Android version.