[Fire TV Q&A, Help & Troubleshooting] Y314K:
Forgot to mention. If you are using any of the old jmandawg methods to expand internal storage on to an external USB HDD. That will not work anymore on FireOS 5. You can still attach a USB drive. But you won't be really expanding internal storage.

Great choice. Just take a deep breath & relax. It is not that hard once you get the gist of the steps. The guide(s) are very detailed so don't worry. And I will help as much as possible. So if you have a ? or don't understand something. Just keep asking until you are comfortable with the steps.

I would also recommend you use a USB Hub, USB Stick (Fat32), USB Keyboard w/mouse pad or USB Keyboard & separate USB Mouse for the update process. Makes thing much simpler if you have all the files you will need in different folders clearly labeled & with MD5 hash verified before getting started.

Yes, you can always redo the Method 1 for FireOS 3 update blocking to verify they are being blocked while working on updating.

That is correct. Since you are on FireOS 3. You only do "Section 1: Fire TV 1 on 51.1.6.3 or older".

This is the order I would do things in:

1- You can uninstall most apps you sideloaded. Just leave TowelRoot & SuperSU installed (Busybox & XPosed will need to be reinstalled once on FireOS 5 so don't worry to much about them. You can even uninstall them if you like). Leave what ever stock Amazon apps are installed alone. Do NOT do a Factory Reset. It causes more problems then it solves. Wait until you have TWRP for any wiping. And even then be careful what you wipe. NEVER WIPE /SYSTEM on neither CWM or TWRP.

2- Make sure ADB Debugging is still turned on. And check root by following step 8 of this guide (STEP 8 ONLY): http://www.aftvnews.com/how-to-root-the-amazon-fire-tv/

3- Check if your Bootloader is Fully or Partially unlocked: http://www.aftvnews.com/how-to-check-if-your-fire-tvs-bootloader-is-unlocked/

If it is NOT Fully Unlocked then follow this guide: http://www.aftvnews.com/how-to-fully-unlock-the-amazon-fire-tv-bootloader/

(Since you are on RBox PreRooted FW v51.1.0.2_user_510058520. CORRECT ? Then you shouldn't need to do any downgrading)

Verify again like in the first link above if you really have a Fully Unlocked Bootloader.

4- Once you have verified a Fully unlocked Bootloader. Then you can install the last version of ClockWork Mod (CWM) v6.0.5.1.4a. YOU WILL NEED TO HAVE A KEYBOARD connected for this part & any part relating to CWM/RECOVERY/TWRP.

(You can verify what version of CWM recovery you have installed at the moment by runing the following command in ADB Shell "adb reboot recovery". That will boot your FTV1 to recovery & that will tell you which recovery you have at the moment. Whether it is stock or CWM v ???) : http://www.aftvnews.com/how-to-update-clockworkmod-custom-recovery-on-the-amazon-fire-tv/

Now that you are on the latest/last CWM v6.0.5.1.4a. You first need to update to PreRooted v51.1.4.0.

(Oct 30, 2014 - Added 51.1.4.0_514006420+updated (md5sum: b1b48348cb56c0b83a3affc9fd06e07e):

https://xdaforums.com/fire-tv/development/prerooted-stock-images-t2882337

Then you need to install RBox Boot Menu (Only after you are on PreRooted ROM v51.1.4.0): http://www.aftvnews.com/how-to-install-a-kernel-boot-menu-on-the-amazon-fire-tv/

And now you can finally update to the last PreRooted ROM for FireOS 3 aka PreRooted ROM v51.1.6.3.

(September 7, 2015 - Added 51.1.6.3_516012020 (md5sum: fcf1a8ddf2f3bc93280af03dcf408ac8):

http://www.aftvnews.com/how-to-install-a-custom-rom-image-on-the-amazon-fire-tv/

As long as you never did a Factory Reset. You should still be blocking updates. You can still reRun the Method 1 Root Update blocking command after each Rom flash if you fell like it.

Yes, You are doing all the Prerequisites including updating to the last PreRooted FireOS 3 ROM. And then installing TWRP & after a successful TWRP installation you will be updating directly to the Latest PreRooted FireOS 5 ROM. The key is having a successful TWRP installation.

The TWRP file you will be installing is:

"July 4, 2016 - TWRP Image 3.0.0-7 (md5sum: cda1a1c1cdd3e25a1caa86f5a5de1eee)". So that command will change to the name of the new file. Do not install v2 or v1. Those are for devices that DO NOT have a Fully Unlocked Bootloader.

Yes. Once you are ready to install the latest PreRooted FireOS 5 ROM. Then we can look at the options for a Factory Reset thru TWRP or just wiping Cache & Dalvik. Then Reblocking updates & installing BusyBox & XPosed, etc. Any ?'s