Specs at Amazon

amazon.com Technical Details Kindle Fire HD 8.9", 8.9" HD display

Ports

USB 2.0 (micro-B connector) port for connection to a PC or Macintosh computer or to connect to the Kindle PowerFast charging accessory. Micro-HDMI (micro-D connector) port for high definition video output to televisions or A/V receivers

Purchased

2012 - Kindle Fire HD 8.9” (Second Generation; 4G option)

        Sat Oct  6 10:59:18 MDT 2018
        System Version: 8.5.1 user 5159720
        Serial Number: B0C9 1102 3252 00XV
        
        Android 4.0 Ice Cream Sandwich
        8.5.1 – latest version for Kindle Fire HD 8.9" (2012)

        I just received a 2nd gen. Fire HD 8.9 tablet from shopgoodwill for $26 including S&H.

        shopgoodwill.com
        16 GB WiFi Only.  Works. Clean ESN. Reset. Model B0C9 2nd Generation. No Charging Cable. 
        
        Order Number: 20113505
        Item Subtotal: $9.99
        Sales Tax (if applicable): $0.00
        Shipping and Handling: $16.16
        Order Total: $26.15
        
        Item: Kindle Fire HD 8.9" e reader in Purple Case - #57346859
        Price: 9.9900 Qty: 1 Ended: 9/15/2018 3:02:06 PM

Android Version

en.wikipedia.org/wiki List of Fire OS versions

        Android 4.0 Ice Cream Sandwich
        
        7.5.1 – latest version for Kindle Fire HD 7" (2012)
        8.5.1 – latest version for Kindle Fire HD 8.9" (2012)
        10.5.1 – latest version for Kindle Fire (2012)

amazon.com/gp/help/ Transfer Content from a Computer to Your Kindle Fire

Open the Kindle Fire folder (titled “Kindle”) on your computer, and then open the Internal storage folder.

Locate the downloaded file on your computer, and then drag and drop the compatible file you want to transfer into the applicable folder:

        Audible: AA, AAX
        Books: AZW (.azw3), MOBI (non-DRM), KF8
        Documents: TXT, PDF, PRC, DOC, DOCX
        Music: MP3, non-DRM AAC (.m4a), MIDI, PCM/WAVE, OGG, WAV
        Pictures: JPEG, GIF, PNG, BMP
        Movies: MP4, 3GP, VP8 (.webm)

blog.the-ebook-reader.com 40 Tips and Tricks for Kindle Fire HD (Video)

The eBook Reader youtube Kindle Fire HD Review + Tips and Tricks - Sep 18, 2012

amazon.com Technical Details Kindle Fire HD 8.9", 8.9" HD display

lovemyfire.com/kindle-fire Which Kindle Fire Tablet Do You Have?

        2011 - Kindle Fire 7" (First Generation)
        2012 - Kindle Fire 7" (Second Generation)
        2012 - Kindle Fire HD 7" (Second Generation)
        2012 - Kindle Fire HD 8.9" (Second Generation; 4G option)
        2013 - Kindle Fire HD 7" (Third Generation)
        2013 - Kindle Fire HDX 7" (Third Generation; 4G option)
        2013 - Kindle Fire HDX 8.9" (Third Generation; 4G option)
        2014 - Kindle Fire HD 6" (Fourth Generation)
        2014 - Kindle Fire HD 7" (Fourth Generation)
        2014 - Kindle Fire HDX 8.9" (Fourth Generation; 4G option)
        2015 - Kindle Fire 7" (Fifth Generation)
        2015 - Kindle Fire HD 8" (Fifth Generation)
        2015 - Kindle Fire HD 10" (Fifth Generation)
        2016 - Kindle Fire HD 8" (Sixth Generation)
        2017 - Kindle Fire 7" (Seventh Generation)
        2017 - Kindle Fire HD 8" (Seventh Generation)
        2017 - Kindle Fire HD 10" (Seventh Generation)

3rd party ebook reader

koreader.rocks koreader

github.com/koreader KOReader WIKI

kobo.com/us/en/p/desktop Purchase and read your favourite eBooks with the free Kobo Desktop App

moondownload.com Moon+ Reader Pro

seanyword@gmail.com

play.google.com/store Monn+ Reader Pro

Research

lifehacker.com/how-to-get How to Get Google Play on a Kindle Fire and Install Any Android App You Want by Eric Ravenscraft

Find popular apps on APK Mirror. This site hosts hundreds of apps from Google, Facebook, Samsung, and many others. Each APK is scanned to verify they’re safe. Best of all, older versions of the app are archived, so you can find the version that works for your device.

FBReader.org Android

FBReader.org APK Android 4.0 and higher

        > On 5 Oct 2018, at 18:00, Craig Anderson <craig@coot.net> wrote:
        >
        > I would like to purchase FBReader Premium and install it on my 2nd
        > gen Fire tablet. I will have to research what version of Android is on
        > it. How would you recommend I pay? Can I install the appropriate APK
        > from your web site or do you have other advice?
        
        Nikolay Pultsin <geometer@fbreader.org>
        
        I’m afraid there is no way to install premium version to a device with
        no google services. Maybe there is a chance to install google stuff to
        your device?
        
        Regards,
        — Nikolay
        
        Reply from me.
        I'm getting advice at mobileread.com forums. I should be able to load your APK.
        https://fbreader.org/files/android/FBReaderJ_ice-cream-sandwich.apk
        Is that the free or premium version?
        I will want to get you payment if I am able to run the premium version.

Side Loading

laptopmag.com/articles How to Sideload Apps On The Kindle Fire

Install Google Play

lifehacker.com/how-to How to Get Google Play on a Kindle Fire and Install Any Android App You Want Eric Ravenscraft

apkmirror.com/apk Google Play Store - variants

APK Downloader APK Downloader

rootjunkysdl.com/files Amazon Fire 5th Gen Super Tool

        Installed but did not work.  Mon Oct 15 12:23:18 MDT 2018
        
        Google Play Store 7.1.25.I-all 137772785 (noarch) (nodpi) (Android 4.0+)
        /home/craig/Downloads/com.android.vending_7.1.25.I-all. ... .apk