Install Amazon 7 Kindle Fire HD CM13 Android 6.0 Marshmallow

This tutorial will teach you how to install CyanogenMod 13 Android 6.0 Marshmallow on your Amazon 7 Kindle Fire HD device.You can, however, choose to wait for the official Android 6.0 Marshmallow for the Amazon 7 Kindle Fire HD OR you can get Android 6.0 Marshmallow on your Amazon 7 Kindle Fire HD via the CM13 ROM.

Before you continue, you should note that you would be required to download and install the necessary Gapps package for your version of Android. 

How To Install CyanogenMod 13 on Amazon 7 Kindle Fire HD

You need a custom recovery like TWRP or PhilZ to successfully install CM13 Nightly ROM on your Amazon 7 Kindle Fire HD. Additionally, you will need Marshmallow Gapps package to enjoy all the Google apps and services.

• CyanogenMod 13 for Amazon 7 Kindle Fire HD (Download)
• Gapps for CM13 (Download)

Download both the ROM and Gapps on your computer and then transfer them to the internal storage of your Amazon 7 Kindle Fire HD.

Installation guide for here