Thanks for the comprehensive and clarifying answer! Your reply would be nice to have in a Kindle developers FAQ or Wiki.
Just an additional question. You wrote "Sending an .img only works with Partition 1 (rootfs)." Does that mean that, in order to recover a bricked Kindle it is only necessary to transfer back partitiopn 1, i.e., the backuped rootfs.img file. Is it not necessary to first make a signed recovery .bin package of the rootfs.img file? If so, can the rootfs.img file be transfered back by only using the recovery terminal?
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