It does not work on the Fire HDX 8.9 (Saturn)!
All steps in this manual are not necessary but they are present for maximum safety. So I highly recommend do anything exactly in this way. Sorry my English as always =)
Update2 - actual method is https://forum.xda-developers.com/sho...postcount=1006
Update: now you can use updated draxie's utility - http://forum.xda-developers.com/kind...oader-t3241014
Prerequisites for Installation
- Installed adb and fastboot drivers - official - https://drive.google.com/open?id=0B2...WdwRl9TQS11b0k (if your system language not English, after fail navigate to "Program Files (x86)\Lab126\drivers" and run dpinst.exe /EL or switch to English =) for x64 need to disable driver signature verification before install ) also you can use pdanet drivers - http://forum.xda-developers.com/show...23&postcount=8
1. Create unlock file following this instruction - https://forum.xda-developers.com/kin...5#post70881555
2. Flash old vulnarable aboot and cubed twrp (just in case). Check that all these commands executed without errors. If you'll get one - read second post below. If your firmware <=13(14)184.108.40.206 skip this step.
Download aboot and twrp for Thor (Kindle Fire HDX 7) https://drive.google.com/open?id=0B2...GxXMUZPZTlZTUk or for Apollo (Kindle Fire HDX 8.9) - https://drive.google.com/open?id=0B2...zJDQkczNzRLaHM - and put this two files (twrp_cubed.img and aboot_vuln.mbn) into root of your kindle internal storage.
adb shell su dd if=/sdcard/twrp_cubed.img of=/dev/block/platform/msm_sdcc.1/by-name/recovery dd if=/sdcard/aboot_vuln.mbn of=/dev/block/platform/msm_sdcc.1/by-name/aboot
3. Flash unlock file.
Now, if you reboot, you will go straight into fastboot because of old aboot - newest boot.img can't load with it. If your firmware <13(14).4.1.1 you need run "adb reboot bootloader" to boot into fastboot.
Time to flash your unlock file.
fastboot -i 0x1949 flash unlock 0xmmssssssss.unlock
Grats. You are perfect =)
You can flash:
CM13 - http://forum.xda-developers.com/kind...11-29-t3259732
CM 12.1 - http://forum.xda-developers.com/kind...-thor-t3050199
Or stock repacked latest 220.127.116.11 rom - https://drive.google.com/open?id=0B2...FFtN2RYNXNUZ0k (13.x - thor, 14.x - apollo)
Do not flash original stock firmwares.
Regards and thank to all - @dpeddi, @vortox, @draxie, @ggow, @Ralekdev, @jcase, @Hashcode
And greatest thanks for motherboard for my experiments to @MahmudS !