[Kindle Fire HDX 7" & 8.9" Q&A, Help & Troubleshoot] Capitan_Veshdoki:
Today I was thinking: "It would be great to install cm12.1 on mine KFHDX7"

So i downgraded my tablet, rooted it with tovelroot and than I found, what i need a twrp. So i tried this:

Full instructions here:

1. Root your Kindle Fire using SuperOneClick and make sure adb is enabled.

2. Download the latest version of FireFireFire, a custom recovery tool for the Kindle Fire.

3. Unzip the utility and copy the u-boot.bin file to the directory where you have adb installed. For instance, c:\androidsdk\

4. Download the twrp-blaze.2.0.0RC0.img, which is the version of TWRP 2.0 for the Kindle Fire.

5. Copy that file to the same directory (such as :\androidsdk\)

6. Open a command prompt by opening the Start Menu and typing “cmd” and pressing enter.

7. Navigate to c:\androidsdk\ or whatever directory you’ve placed your files in by entering “cd c:\androidsdk\” or the appropriate directory.

8a. Make sure your tablet is connected to your computer with a USB cable.

8b. Optional: type “adb devices” to make sure your Kindle Fire is connected and adb is functioning properly. If this works, you should see a listing for your device.

9. Copy the two files to your Kindle SD card by entering the following commands and pressing enter after each:

adb push u-boot.bin /sdcard/

adb push twrp-blaze-2.0.0RC0.img /sdcard/

10. Open an ADB shell and then install the bootloader and recovery by entering the following commands one at a time. Note that if you get a message saying “permission denied,” it means that your tablet hasn’t been rooted properly. Try running SuperOneClick again.

adb shell

su

dd if=/sdcard/twrp-blaze-2.0.0RC0.img of=/dev/block/mmcblk0p5

dd if=/sdcard/u-boot.bin of=/dev/block/mmcblk0p2

11. Reboot your device with the following commands.

exit

adb reboot

I wasn't mentioned, what this tutorial is for Fire HD and I bricked my device.

What should I do?

---------------------------UPDATE-----------------------------------

I tried this method: http://xdaforums.com/kindle-fire-hdx/general/how-to-unbrick-kindle-fire-hdx-firmware-t3277197

But there was a "Destructive error (0x8000ffff)"

Full log here:

[00000B98]CreateManagedObject(1392): Неопознанная ошибка(0x80131604)

[00000B98]GetFactoryObject(1436): Неопознанная ошибка(0x80131604)

[00000B98]CreateManagedObject(1392): Неопознанная ошибка(0x80131604)

[00000B98]GetFactoryObject(1436): Неопознанная ошибка(0x80131604)

[00000B98]GetFactoryObject(1457): Указанная служба не существует.(0x800704db)

[00000B98]GetSearchPath(1512): Указанная служба не существует.(0x800704db)

[0000111C]CEmergencyFlasher::IsQPSTServer(647): Не поддерживается(0x80004001)

[0000111C]COM10	0.06	Load programmer "I:\Users\Aldu\Downloads\kindle unbrick\fw\prog_emmc_firehose_8974.mbn"

[0000111C]DownloadFlashProgrammerDMSS(625): Была сделана попытка загрузить программу, имеющую неверный формат.(0x8007000b)

[0000111C]DownloadFlashProgrammer(909): Была сделана попытка загрузить программу, имеющую неверный формат.(0x8007000b)

[0000111C]COM10	0.06	Open programmer "I:\Users\Aldu\Downloads\kindle unbrick\fw\prog_emmc_firehose_8974.mbn"

[0000111C]COM10	0.06	Open serial port "\\.\COM10"

[0000111C]COM10	0.06	Receiving hello packet

[0000111C]ReadRobust(202): Достигнут конец файла.(0x80070026)

[0000111C]ReadRobust(202): Достигнут конец файла.(0x80070026)

[0000111C]ReadRobust(202): Достигнут конец файла.(0x80070026)

[0000111C]ReadRobust(202): Достигнут конец файла.(0x80070026)

[0000111C]ReadRobust(202): Достигнут конец файла.(0x80070026)

[0000111C]ReadRobust(202): Достигнут конец файла.(0x80070026)

[0000111C]ReadRobust(202): Достигнут конец файла.(0x80070026)

[0000111C]ReadRobust(202): Достигнут конец файла.(0x80070026)

[0000111C]ReadRobust(202): Достигнут конец файла.(0x80070026)

[0000111C]ReadRobust(202): Достигнут конец файла.(0x80070026)

[0000111C]ReadRobust(209): Достигнут конец файла.(0x80070026)

[0000111C]DownloadFlashProgrammerSahara(760): Достигнут конец файла.(0x80070026)

[0000111C]COM10	2.08	Missed hello packet, try to recover

[0000111C]ReadRobust(202): Достигнут конец файла.(0x80070026)

[0000111C]ReadRobust(202): Достигнут конец файла.(0x80070026)

[0000111C]ReadRobust(202): Достигнут конец файла.(0x80070026)

[0000111C]ReadRobust(202): Достигнут конец файла.(0x80070026)

[0000111C]ReadRobust(202): Достигнут конец файла.(0x80070026)

[0000111C]ReadRobust(202): Достигнут конец файла.(0x80070026)

[0000111C]ReadRobust(202): Достигнут конец файла.(0x80070026)

[0000111C]ReadRobust(202): Достигнут конец файла.(0x80070026)

[0000111C]ReadRobust(202): Достигнут конец файла.(0x80070026)

[0000111C]ReadRobust(202): Достигнут конец файла.(0x80070026)

[0000111C]ReadRobust(209): Достигнут конец файла.(0x80070026)

[0000111C]COM10	4.07	Switch mode back

[0000111C]COM10	4.07	Receiving hello packet

[0000111C]COM10	4.07	Send hello response

[0000111C]COM10	4.07	ReadDataPacket id 13, offset 00000000, length 80

[0000111C]COM10	4.07	ReadDataPacket id 13, offset 0x000050, length 4096

[0000111C]COM10	4.07	ReadDataPacket id 13, offset 0x001050, length 4096

[0000111C]COM10	4.07	ReadDataPacket id 13, offset 0x002050, length 4096

[0000111C]COM10	4.07	ReadDataPacket id 13, offset 0x003050, length 4096

[0000111C]COM10	4.07	ReadDataPacket id 13, offset 0x004050, length 4096

[0000111C]COM10	4.07	ReadDataPacket id 13, offset 0x005050, length 4096

[0000111C]COM10	4.07	ReadDataPacket id 13, offset 0x006050, length 4096

[0000111C]COM10	4.07	ReadDataPacket id 13, offset 0x007050, length 4096

[0000111C]COM10	4.07	ReadDataPacket id 13, offset 0x008050, length 4096

[0000111C]COM10	4.07	ReadDataPacket id 13, offset 0x009050, length 4096

[0000111C]COM10	4.07	ReadDataPacket id 13, offset 0x00a050, length 4096

[0000111C]COM10	4.07	ReadDataPacket id 13, offset 0x00b050, length 4096

[0000111C]COM10	4.07	ReadDataPacket id 13, offset 0x00c050, length 4096

[0000111C]COM10	4.07	ReadDataPacket id 13, offset 0x00d050, length 4096

[0000111C]COM10	4.07	ReadDataPacket id 13, offset 0x00e050, length 4096

[0000111C]COM10	4.07	ReadDataPacket id 13, offset 0x00f050, length 4096

[0000111C]COM10	4.07	ReadDataPacket id 13, offset 0x010050, length 4096

[0000111C]COM10	4.07	ReadDataPacket id 13, offset 0x011050, length 2136

[0000111C]COM10	4.07	EndTransferPacket id 13, status 0

[0000111C]COM10	4.07	Send done packet

[0000111C]COM10	4.07	Open serial port "\\.\COM10"

[0000111C]COM10	8.24	Send nop command

[0000111C]COM10	8.24	Send configure command

[0000111C]CSerialDevice::CreateInstance(1215): Разрушительный сбой(0x8000ffff)

[0000111C]CSoftwareDownload::DownloadBySettings(2961): Разрушительный сбой(0x8000ffff)

[0000111C]CEmergencyFlasher::DoWork(624): Разрушительный сбой(0x8000ffff)

[0000111C]GetFactoryObject(1457): Указанная служба не существует.(0x800704db)

[0000111C]SaveFlashResult(1478): Указанная служба не существует.(0x800704db)

[00000B98]GetFactoryObject(1457): Указанная служба не существует.(0x800704db)

[00000B98]GetSearchPath(1512): Указанная служба не существует.(0x800704db)

[000010E8]CEmergencyFlasher::IsQPSTServer(647): Не поддерживается(0x80004001)

[000010E8]COM10	0.06	Load programmer "I:\Users\Aldu\Downloads\kindle unbrick\fw\prog_emmc_firehose_8974.mbn"

[000010E8]DownloadFlashProgrammerDMSS(625): Была сделана попытка загрузить программу, имеющую неверный формат.(0x8007000b)

[000010E8]DownloadFlashProgrammer(909): Была сделана попытка загрузить программу, имеющую неверный формат.(0x8007000b)

[000010E8]COM10	0.06	Open programmer "I:\Users\Aldu\Downloads\kindle unbrick\fw\prog_emmc_firehose_8974.mbn"

[000010E8]COM10	0.06	Open serial port "\\.\COM10"

[000010E8]COM10	0.06	Receiving hello packet

[000010E8]ReadRobust(202): Достигнут конец файла.(0x80070026)

[000010E8]ReadRobust(202): Достигнут конец файла.(0x80070026)

[000010E8]ReadRobust(202): Достигнут конец файла.(0x80070026)

[000010E8]ReadRobust(202): Достигнут конец файла.(0x80070026)

[000010E8]ReadRobust(202): Достигнут конец файла.(0x80070026)

[000010E8]ReadRobust(202): Достигнут конец файла.(0x80070026)

[000010E8]ReadRobust(202): Достигнут конец файла.(0x80070026)

[000010E8]ReadRobust(202): Достигнут конец файла.(0x80070026)

[000010E8]ReadRobust(202): Достигнут конец файла.(0x80070026)

[000010E8]ReadRobust(202): Достигнут конец файла.(0x80070026)

[000010E8]ReadRobust(209): Достигнут конец файла.(0x80070026)

[000010E8]DownloadFlashProgrammerSahara(760): Достигнут конец файла.(0x80070026)

[000010E8]COM10	2.06	Missed hello packet, try to recover

[000010E8]COM10	2.06	Switch mode back

[000010E8]COM10	2.06	Receiving hello packet

[000010E8]COM10	2.06	Send hello response

[000010E8]COM10	2.06	ReadDataPacket id 13, offset 00000000, length 80

[000010E8]COM10	2.06	ReadDataPacket id 13, offset 0x000050, length 4096

[000010E8]COM10	2.06	ReadDataPacket id 13, offset 0x001050, length 4096

[000010E8]COM10	2.06	ReadDataPacket id 13, offset 0x002050, length 4096

[000010E8]COM10	2.06	ReadDataPacket id 13, offset 0x003050, length 4096

[000010E8]COM10	2.06	ReadDataPacket id 13, offset 0x004050, length 4096

[000010E8]COM10	2.06	ReadDataPacket id 13, offset 0x005050, length 4096

[000010E8]COM10	2.06	ReadDataPacket id 13, offset 0x006050, length 4096

[000010E8]COM10	2.06	ReadDataPacket id 13, offset 0x007050, length 4096

[000010E8]COM10	2.06	ReadDataPacket id 13, offset 0x008050, length 4096

[000010E8]COM10	2.06	ReadDataPacket id 13, offset 0x009050, length 4096

[000010E8]COM10	2.06	ReadDataPacket id 13, offset 0x00a050, length 4096

[000010E8]COM10	2.06	ReadDataPacket id 13, offset 0x00b050, length 4096

[000010E8]COM10	2.06	ReadDataPacket id 13, offset 0x00c050, length 4096

[000010E8]COM10	2.06	ReadDataPacket id 13, offset 0x00d050, length 4096

[000010E8]COM10	2.06	ReadDataPacket id 13, offset 0x00e050, length 4096

[000010E8]COM10	2.06	ReadDataPacket id 13, offset 0x00f050, length 4096

[000010E8]COM10	2.06	ReadDataPacket id 13, offset 0x010050, length 4096

[000010E8]COM10	2.06	ReadDataPacket id 13, offset 0x011050, length 2136

[000010E8]COM10	2.06	EndTransferPacket id 13, status 0

[000010E8]COM10	2.06	Send done packet

[000010E8]COM10	2.08	Open serial port "\\.\COM10"

[000010E8]COM10	6.22	Send nop command

[000010E8]COM10	6.22	Send configure command

[000010E8]CSerialDevice::CreateInstance(1215): Разрушительный сбой(0x8000ffff)

[000010E8]CSoftwareDownload::DownloadBySettings(2961): Разрушительный сбой(0x8000ffff)

[000010E8]CEmergencyFlasher::DoWork(624): Разрушительный сбой(0x8000ffff)

[000010E8]GetFactoryObject(1457): Указанная служба не существует.(0x800704db)

[000010E8]SaveFlashResult(1478): Указанная служба не существует.(0x800704db)

[00000B98]GetFactoryObject(1457): Указанная служба не существует.(0x800704db)

[00000B98]GetSearchPath(1512): Указанная служба не существует.(0x800704db)

[000000A4]CEmergencyFlasher::IsQPSTServer(647): Не поддерживается(0x80004001)

[000000A4]COM10	0.05	Load programmer "I:\Users\Aldu\Downloads\kindle unbrick\fw\prog_emmc_firehose_8974.mbn"

[000000A4]DownloadFlashProgrammerDMSS(625): Была сделана попытка загрузить программу, имеющую неверный формат.(0x8007000b)

[000000A4]DownloadFlashProgrammer(909): Была сделана попытка загрузить программу, имеющую неверный формат.(0x8007000b)

[000000A4]COM10	0.05	Open programmer "I:\Users\Aldu\Downloads\kindle unbrick\fw\prog_emmc_firehose_8974.mbn"

[000000A4]COM10	0.05	Open serial port "\\.\COM10"

[000000A4]COM10	0.05	Receiving hello packet

[000000A4]ReadRobust(202): Достигнут конец файла.(0x80070026)

[000000A4]ReadRobust(202): Достигнут конец файла.(0x80070026)

[000000A4]ReadRobust(202): Достигнут конец файла.(0x80070026)

[000000A4]ReadRobust(202): Достигнут конец файла.(0x80070026)

[000000A4]ReadRobust(202): Достигнут конец файла.(0x80070026)

[000000A4]ReadRobust(202): Достигнут конец файла.(0x80070026)

[000000A4]ReadRobust(202): Достигнут конец файла.(0x80070026)

[000000A4]ReadRobust(202): Достигнут конец файла.(0x80070026)

[000000A4]ReadRobust(202): Достигнут конец файла.(0x80070026)

[000000A4]ReadRobust(202): Достигнут конец файла.(0x80070026)

[000000A4]ReadRobust(209): Достигнут конец файла.(0x80070026)

[000000A4]DownloadFlashProgrammerSahara(760): Достигнут конец файла.(0x80070026)

[000000A4]COM10	2.06	Missed hello packet, try to recover

[000000A4]ReadRobust(202): Достигнут конец файла.(0x80070026)

[000000A4]ReadRobust(202): Достигнут конец файла.(0x80070026)

[000000A4]ReadRobust(202): Достигнут конец файла.(0x80070026)

[000000A4]ReadRobust(202): Достигнут конец файла.(0x80070026)

[000000A4]ReadRobust(202): Достигнут конец файла.(0x80070026)

[000000A4]ReadRobust(202): Достигнут конец файла.(0x80070026)

[000000A4]ReadRobust(202): Достигнут конец файла.(0x80070026)

[000000A4]ReadRobust(202): Достигнут конец файла.(0x80070026)

[000000A4]ReadRobust(202): Достигнут конец файла.(0x80070026)

[000000A4]ReadRobust(202): Достигнут конец файла.(0x80070026)

[000000A4]ReadRobust(209): Достигнут конец файла.(0x80070026)

[000000A4]COM10	4.06	Switch mode back

[000000A4]COM10	4.06	Receiving hello packet

[000000A4]COM10	4.06	Send hello response

[000000A4]COM10	4.06	ReadDataPacket id 13, offset 00000000, length 80

[000000A4]COM10	4.06	ReadDataPacket id 13, offset 0x000050, length 4096

[000000A4]COM10	4.06	ReadDataPacket id 13, offset 0x001050, length 4096

[000000A4]COM10	4.06	ReadDataPacket id 13, offset 0x002050, length 4096

[000000A4]COM10	4.06	ReadDataPacket id 13, offset 0x003050, length 4096

[000000A4]COM10	4.06	ReadDataPacket id 13, offset 0x004050, length 4096

[000000A4]COM10	4.06	ReadDataPacket id 13, offset 0x005050, length 4096

[000000A4]COM10	4.06	ReadDataPacket id 13, offset 0x006050, length 4096

[000000A4]COM10	4.06	ReadDataPacket id 13, offset 0x007050, length 4096

[000000A4]COM10	4.06	ReadDataPacket id 13, offset 0x008050, length 4096

[000000A4]COM10	4.06	ReadDataPacket id 13, offset 0x009050, length 4096

[000000A4]COM10	4.06	ReadDataPacket id 13, offset 0x00a050, length 4096

[000000A4]COM10	4.06	ReadDataPacket id 13, offset 0x00b050, length 4096

[000000A4]COM10	4.06	ReadDataPacket id 13, offset 0x00c050, length 4096

[000000A4]COM10	4.06	ReadDataPacket id 13, offset 0x00d050, length 4096

[000000A4]COM10	4.06	ReadDataPacket id 13, offset 0x00e050, length 4096

[000000A4]COM10	4.06	ReadDataPacket id 13, offset 0x00f050, length 4096

[000000A4]COM10	4.06	ReadDataPacket id 13, offset 0x010050, length 4096

[000000A4]COM10	4.06	ReadDataPacket id 13, offset 0x011050, length 2136

[000000A4]COM10	4.06	EndTransferPacket id 13, status 0

[000000A4]COM10	4.06	Send done packet

[000000A4]COM10	4.06	Open serial port "\\.\COM10"

[000000A4]COM10	8.22	Send nop command

[000000A4]COM10	8.22	Send configure command

[000000A4]CSerialDevice::CreateInstance(1215): Разрушительный сбой(0x8000ffff)

[000000A4]CSoftwareDownload::DownloadBySettings(2961): Разрушительный сбой(0x8000ffff)

[000000A4]CEmergencyFlasher::DoWork(624): Разрушительный сбой(0x8000ffff)

[000000A4]GetFactoryObject(1457): Указанная служба не существует.(0x800704db)

[000000A4]SaveFlashResult(1478): Указанная служба не существует.(0x800704db)

After second try i rebooted my device and Windows now says "Unknown device". I haven't got any ideas.