[Fire HD 8 and HD 10 Original Android Development] opec:
@willgaj did you enter bootloader mode on the Fire ? Powerdown and then Press VolUp + Power, wait until you see "Enter Recovery" , then select "Bootloader".

Heres how it worked out for me:

Files I used:

amonet-douglas-v1.2.zip from first Page of this Thread:

https://xdaforums.com/attachments/amonet-douglas-v1-2-zip.4845269/

Unpack the Archive to a separate Folder.

brick-douglas.zip from first Page of this Thread:

https://xdaforums.com/attachments/brick-douglas-zip.4825253/

Unpack the Archive to a separate Folder.

MTK-su (i used te 64 bit) from here:

https://xdaforums.com/t/rapid-temporary-root-for-hd-8-hd-10.3904595/

Unpack and copy to the MTK-su from the 64 Bit folder to the “bin” folders of the previous unpacked folders.

Unlock steps:

Reboot FireHD8 to Recovery (Power Off device, then hold VolUp + Power)

Select Facotry Reset then Wipe Cache

Reboot to Bootloader

You will see the balck screen with “Fastboot” in the lower corner.

Open Terminal from “brick-douglas” folder an enter “sudo ./brick.sh

”

Check Display output for the “Disconnect USB and Powerdown” Message and do so when prompted

(If theres an Error see below Step 12)

Open Terminal from “amonet-douglas-v1.2” foder.

Enter “sudo ./bootrom-step.sh"

Reconnet USB

Wait until the bootrom step is finished

Enter “sudo ./fastboot-step.sh”

You will end up in TWRP

If theres an error let the FireHD Reboot and do the “Apps and Data Optimization” at the Welcome Install Screen Powerdown the FireHD and enter Bootloader again.

Open Terminal from “brick-douglas” folder

Enter “sudo ./brick-8920.sh”

Check Display output for the “Disconnect usb and powerdown” message and do so when prompted.

Enter “sudo ./bootrom-step.sh

Reconnet USB

Wait until the bootrom step is finished.

Enter “sudo ./fastboot-step.sh"

You will end up in TWRP

Lineage OS installation:

Prepare a Micro SD Card with: Lineage OS (Search the forum for the douglas (FireHD 8 7.Gen) or suez (FireHD 10 7Gen) Version, Gapps (ARM64, 7.1, nano) and Magisk and insert in FireHD.

In TWRP Format Data and Wipe data, system, cache.

Install Rom, gapps and magisk

Reboot to Lineage OS

Hardware Method:

If you got stuck somewhere in the middle or the Exploit doesn’t work try the hardware method.

I somehow bricked my HD10 , I think I disconnected the USB because I was to unpatient.

For the Hardware method, you need to open the Tablet, use a prytool or a Creditcars / Knife to remove the backcover, just gently pry around the bezel until the screen pops out.

You need to unscrew the mainboard and gently flip it over , on the HD10 I didn’t had to remove any wire , just be carefull with the speakers and put a piece of cardboard or plastic on the back between the mainboard and battery so it will not shorten or puncture the battery.

Find the CLK pin (theres several pictures on the forum for your specific device) use a piece of wire or paperclip to shorten from a ground plane or the SD Card slot housing to the clock pin. This works best if you got someone that will help you.

Connect USB to the Tablet, but leave it unplugged on the Computer side.

Make sure the Tablet is powered down (Press and hold Power button for 30 seconds)

Open Terminal from “amonet-douglas-v1.2” foder.

Enter “sudo ./bootrom-step.sh”

Now shorten CLK to ground and hold it.

Ask a kind person to plug in the USB cable on the Computer now.

The Terminal will tell you to remove the wire when ready.

Press enter and wait for bootrom-step.sh to finish.

If an error during bootrom step occurs , just retry

After bootrom step is finished, enter “sudo ./fastboot-step.sh”

You will end up in TWRP

PS: I directly installed LOS 14.1 on the HD8 , on the HD10 i i used LOS 12.1 because LOS 14.1 is missing Camera Support on the HD10 in fact loosing the camera shouldnt trouble too much as the picture quality is horrible anyways. As for now I am happy to have a running Android on the tabs and don´t need to worry amazon giving me headaches every few weeks when updating CrapOS and redndering my configuration unuseable , i got 14 HD8/10 deloyed around the house as input devices for Homeautomation (running Habpannel).

One thing to mention when switching to LOS, is that you can´t use apps that need to be certified anymore, like Netflix, Banking etc.

Good luck!

PPS: Thanks a lot to k4y0z and his fellas for the great job!

opec