Sorry for the trouble.
I’ve updated the repository on Codeberg and also added a GitHub mirror:
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https://codeberg.org/dominikfalkner/...era_lite_pb710
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https://github.com/falknerdominik/zenreader-pocketbook
I hope it’s helpful. Some of the relevant information is difficult to find online, and a few details, such as the correct icon size, required some trial and error.