KINDLE FIRE HD 8.9 ONLY!!! USE AT YOUR OWN RISK!!
This is an update to the KFHD_SRTool, now for use with the Kindle Fire HD 8.9
This is ONLY for use with 8.9" models, not for use with 7" unless you replace system.img with your own backup.
A factory cable is not needed to enable fastboot on this model. Even if the device is in a loop and ADB can not recognize it. I have personally put my device in a loop to confirm it works. To enable fastboot use option 1 from the tool
1. Download and unzip the tool of your choice from the link below (I have confirmed you can downgrade from 8.1.4 to 8.1.3)
2. Run SR Tool
That's it, wait for the tool to finish. Be patient this can take a few minutes. To exit fastboot use option 6 or hold down the power button for 10-20 seconds. When you reboot the first time it may seem to loop once but this is normal and will boot up. Once again be patient, especially if you chose to erase cache and userdata. The system needs to rebuild those partitions. Hope this helps some of you in the community. Again sorry for the size of the download, this is why I made this a separate tool instead of combining it with the HD7 version.
System backup from v8.1.3 KFHD_SRTool_v2.0
Option menu has changed
New options: Install of GoogleServicesFramework.apk, enable fastboot with device powered on or off.
Option 4 removed due to new option of enable fastboot
I no longer own this device so I cannot make backups of newer system versions, for the time being here are instructions for downgrading to 8.1.4:
1.) Download boot and recovery imgs(these are backups from 8.1.4) from this LINK and place in the folder where you have access to fastboot or inside the KFHD_SRTool_v2.1 folder
2.) Use KFHD_SRTool_v2.1 to flash system.img.
3.) Erase userdata and cache
4.) Open a cmd prompt from the folder where you placed the previously downloaded .img's.
Use these cmds:
fastboot -i 0x1949 flash boot boot.img fastboot -i 0x1949 flash recovery recovery.img
Thanks to mdblaze for bringing to my attention that a factory cable is not needed with this device
Again Thanks to kinfauns for the how to on backing up and restoring system software.