Thanks for the reminder. I have not tried it yet and I forgot about it.
Yes, you can repair a completely erased kindle 4 or newer by using imx_usb_loader or MfgTool to send this custom u-boot image with fastboot protocol built-in (crafted by Eureka
) to the Kindle over the USB cable. That will boot the kindle directly into fastboot mode, so you can use the fastboot tool to flash debricking repair images to the Kindle.
I will need to download the fastboot u-boot image and include it into the MfgTool package in the select boot thread when I get around to it.
EDIT: With this valuable addition to our debricking repair tools, you can repair a completely erased kindle without opening it or using its serial port. Thanks Eureka!