[Kindle Fire HDX 7" & 8.9" Q&A, Help & Troubleshoot] ricer333:
First and foremost thank you all (@Cl4ncy, [MENTION=5488402]Davey126[/MENTION] and [MENTION=5940066]EncryptedCurse[/MENTION], and [MENTION=6943038]p-4[/MENTION]) for the detailed information. I have been basically not using my Kindle Fire 7 HDX since I was gifted it last Christmas from my parents. I am now a traveling consultant and this was bought to keep me entertained while flying all over the country.

I went through the process last Sunday and successfully did it on my first attempt. My home PC is still on WinXP, so there were a few things that needed to be done on this OS that Vista/Win7+ doesn't require. I also have the MD5 checksums for all the files that are used in this installation. I would like to post the few things that I learned as well as the MD5 checksums that can be easily computed using WinMD5 Free (http://winmd5.com/)

First things first, the MD5 checksums for the THOR (Kindle Fire 7 HDX) downloads:

The format is as follows: zip file name :: md5 hash

If wanting to run Nexus OS (did not install this, went with CM11, but provided just for completeness)

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HDX_Nexus_Gapps-v2.1.zip :: b02f6bbd39f3246bff72eb39dd8f42ef

HDX_Nexus_ROM_Thor-v4.0.5.zip :: fdb573f1323b0d665f10b07666f5b315

If wanting to run CM11 (YES, I do!)

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cm-11-SAFESTRAP-20150928-UNOFFICIAL-thor.zip :: cf539eea460fb917d7f33c7853a9f4c5

open_gapps-arm-4.4-nano-20150930.zip :: 23748a51ecd5c1275ec5d310029e8f61

open_gapps-arm-4.4-mini-20150930.zip :: 21d0871dc548e33442d8358f19346829

open_gapps-arm-4.4-micro-20150930.zip :: dcdb72ab0762efbe2902fc3710eacdb5

open_gapps-arm-4.4-full-20150930.zip :: f91668b9a7f01168847e44e3899a39e6

-----------------------------------------------------------------------------------------------------------------------------------------

minimal_adb_fastboot_v1.3.1_setup.zip :: D72D659D2B206C14B6FEA6F1E7311A63

* update-kindle-13.4.5.2_user_452004120.bin :: 6abfc6bdf72b2a23c229c6d0311a9a96 (took several minutes to compute using WinMD5Free tool)

* omegavesko-simpleadbbackup-0790701.zip :: bfda65a5a8448e463f448daecebd6957 (calculated after download)

* UPDATE-SuperSU-v2.46.zip :: 332de336aee7337954202475eeaea453

* eu.chainfire.supersu-2.46-246-Android-2.1.apk :: e75410f8e31fe505adb26d6a07725689

The last four marked with asterisks (*) are the computed MD5 checksums as I could not find them posted anywhere. They worked and I haven't seen any abnormal activity, so I am assuming they are fine and not malicious.

Interesting Notables for my installation (using WinXP)

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First, my Kindle OS version was 4.3.1 (January build date) so I did not have to rollback to any previous software

Note: I downloaded and installed KingRoot and ES File Explorer before upgrading from 4.5.1 to 4.5.2. I did not have to push the files to the Kindle Fire as they still existed after the upgrade to 4.5.2

Downloaded, installed Universal ADB Drivers:

Rebooted machine for Kindle/WinXP to properly use & find the ADB Drivers

MTP still not working. Downloaded MTP porting kit: http://www.microsoft.com/en-in/download/confirmation.aspx?id=19153

MTP requires reboot of computer, did that again.

Plugged in Kindle and opened up device manager. MTP still had the (!) exclamation mark, so bit the bullet and downloaded/installed Windows Media Player 11:

http://www.microsoft.com/en-us/download/windows-media-player-details.aspx?id=8163

Windows XP does not contain the MTP service/libraries, hence having to bite the bullet and download/install WMP11 :P

After multiple reboots and MTP still not working, I came across a thread on http://www.amazon.com/forum/kindle?_encoding=UTF8&cdForum=Fx1D7SY3BVSESG&cdThread=TxTLX60GDNGVPT

Top post said to disable ADB debugging interface. Did this and then 'Fire' showed up in Win Media Player 11 as well as 'My Computer' explorer

Manually Backed up all files/folders (not that there was much to backup)

downloaded minimal_adb_fastboot_v1.3.1_setup (Norton 360 kept trying to remove it as a threat). The MD5 checksum was verified by the download links

downloaded omegavesko-simpleadbbackup-0790701.zip and unzipped it to it's own folder. No MD5 validation checksum for this. Calcuated one by using WinMD5Free.

To get around good ol' Norton, I briefly disabled the auto-protect feature so that I could push the file to the Kindle.

pushed update-kindle-13.4.5.2_user_452004120.bin to internal_storage per procedure. Updated (need 30% for OS to update). Stayted on 'Verifying update file' for quite a bit of time (upwards of 15 minutes). This was important. This 'verifying update file' had me very nervous. I was googling how long it should take and nowhere did anyone say anything about it taking a long time. Please be patient, it is a large file and I'm sure it is generating a checksum to verify the validity.

Kindle automatically rebooted, and got to 'KindleFire Installing system update screen'

automatic reboot again (grey fire then gold fire)

Then 'Fire is upgrading...' Spinning wheel 'Please wait...'

I did backup the STOCK slot but I did not see an option to 'delete' the other slots (1-4 I think?). I just left them. I did install the CM11 OS to STOCK slot and I have had AWESOME battery life.

In my research, I came across what the different generations/names mean I'll put it here in case anyone else was curious. Supposedly HDX == 3rd Generation, Kindle Fire == 1st and Kindle Fire HD == 2nd gen. I'm not sure about the 4th and upwards.

That is end of my additional information. Once again, thank you all! I really enjoy having CM11 running on my Kindle Fire HDX and will now be using it a whole heck of a lot more :D