I was using the jailbreak (I had to downgrade the firmware) but was only using it for the covers function. So I decided to remove the jailbreak and upgrade the firmware, and this cover thing works very nice, and the setting appeared as soon as I upgraded to the latest firmware.
Location: México (no "ads" option to buyers here)
device: kindle paperwhite 10th
works fine with sideloaded books. I only use sideloaded books on my kindle (calibre, through usb cable, converted epub to azw3, I always use the function "polish book, update cover option" before converting).
kindle automatically adds black bars at the sides of the cover, since the size of the picture does not matches the kindles' screen size.
thats my report. No need for a jailbreak for me anymore.
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