I don't know why you opened a new thread but it doesn't matter.
The UImage from the update file is the kernel of the system. You unnecessarily downloaded its sources. All you have to do is stop the u-boot, type the bist fastboot command. Then you connect the reader via USB to the computer and use fastboot for kindle to save the kernel (fastboot flash kernel u-Image).
Once you have a working kernel, you stop it from booting and initialize partitions, share FAT partitions, burn an update file to it, update it, and enjoy a working reader.
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