A little update. It stopped giving me the error for some reason, and seems to enter fastboot from MfgTool, but after I choose the driver (Kindle-Fastboot.inf) it installs it, then all HID devices just disappear from device manager and the flasher does not recognize the device.
Also, a very strange thing. It appears in HID devices after I press the power button for a couple of seconds, without the LED turning off and pressing the "magic button".
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