[Kindle Fire HDX 7" & 8.9" General] silencer_ar:
Hi! I have a bricked Kindle Fire HDX 7" model # C9R6QM. I really don't know what FW version it has. I've never rooted it nor unlocked it. It boots to a screen with the Kindle Fire logo and a menu for rebooting the device or resetting to factory settings. No option does any good and always end up in the same screen. I tried first with this method, but it fails (more details below).

I was reading that there was a Shorting Trick (for USB booting) for the HD, is there anything like it for the HDX?

As for MiFlash: I followed the instructions using MiFlash. I put the device in the correct mode with a fastboot cable, and MiFlash detects it. When I click the Flash button (after setting the correct paths to the files), and this happens:

[00003634]CreateManagedObject(1392): Unspecified error(0x80131604)
[00003634]GetFactoryObject(1436): Unspecified error(0x80131604)
[00003634]CreateManagedObject(1392): Unspecified error(0x80131604)
[00003634]GetFactoryObject(1436): Unspecified error(0x80131604)
[00003634]GetFactoryObject(1457): The specified service does not exist.(0x800704db)
[00003634]GetSearchPath(1512): The specified service does not exist.(0x800704db)
[000023A8]CEmergencyFlasher::IsQPSTServer(647): Not implemented(0x80004001)
[000023A8]COM5	0.09	Load programmer "C:\Users\silencer\Downloads\kindle unbrick\fw\prog_emmc_firehose_8974.mbn"
[000023A8]DownloadFlashProgrammerDMSS(625): An attempt was made to load a program with an incorrect format.(0x8007000b)
[000023A8]DownloadFlashProgrammer(909): An attempt was made to load a program with an incorrect format.(0x8007000b)
[000023A8]COM5	0.09	Open programmer "C:\Users\silencer\Downloads\kindle unbrick\fw\prog_emmc_firehose_8974.mbn"
[000023A8]COM5	0.09	Open serial port "\\.\COM5"
[000023A8]COM5	0.09	Receiving hello packet
[000023A8]COM5	0.09	Send hello response
[000023A8]COM5	0.09	ReadDataPacket id 13, offset 00000000, length 80
[000023A8]COM5	0.09	ReadDataPacket id 13, offset 0x000050, length 4096
[000023A8]COM5	0.09	ReadDataPacket id 13, offset 0x001050, length 4096
[000023A8]COM5	0.09	ReadDataPacket id 13, offset 0x002050, length 4096
[000023A8]COM5	0.09	ReadDataPacket id 13, offset 0x003050, length 4096
[000023A8]COM5	0.09	ReadDataPacket id 13, offset 0x004050, length 4096
[000023A8]COM5	0.09	ReadDataPacket id 13, offset 0x005050, length 4096
[000023A8]COM5	0.09	ReadDataPacket id 13, offset 0x006050, length 4096
[000023A8]COM5	0.09	ReadDataPacket id 13, offset 0x007050, length 4096
[000023A8]COM5	0.09	ReadDataPacket id 13, offset 0x008050, length 4096
[000023A8]COM5	0.09	ReadDataPacket id 13, offset 0x009050, length 4096
[000023A8]COM5	0.11	ReadDataPacket id 13, offset 0x00a050, length 4096
[000023A8]COM5	0.11	ReadDataPacket id 13, offset 0x00b050, length 4096
[000023A8]COM5	0.11	ReadDataPacket id 13, offset 0x00c050, length 4096
[000023A8]COM5	0.11	ReadDataPacket id 13, offset 0x00d050, length 4096
[000023A8]COM5	0.11	ReadDataPacket id 13, offset 0x00e050, length 4096
[000023A8]COM5	0.11	ReadDataPacket id 13, offset 0x00f050, length 4096
[000023A8]COM5	0.11	ReadDataPacket id 13, offset 0x010050, length 4096
[000023A8]COM5	0.11	ReadDataPacket id 13, offset 0x011050, length 2136
[000023A8]COM5	0.11	EndTransferPacket id 13, status 0
[000023A8]COM5	0.11	Send done packet
[000023A8]COM5	0.11	Open serial port "\\.\COM5"
[000023A8]COM5	10.11	Send nop command
[000023A8]COM5	10.11	Send configure command
[000023A8]CSerialDevice::CreateInstance(1215): Catastrophic failure(0x8000ffff)
[000023A8]CSoftwareDownload::DownloadBySettings(2961): Catastrophic failure(0x8000ffff)
[000023A8]CEmergencyFlasher::DoWork(624): Catastrophic failure(0x8000ffff)
[000023A8]GetFactoryObject(1457): The specified service does not exist.(0x800704db)
[000023A8]SaveFlashResult(1478): The specified service does not exist.(0x800704db)

Do you know what might be happening?

Thank you!!