I hope this means that you have the device working again.
As far as getting pbimageviewer.app working, I don't have any suggestions at this time. Maybe you can contact PocketBook and ask them to update their SDK. I don't think I can give you anything until they do that.
I noticed that koreader supports CBZ files. Maybe it also supports CBR, as well. If it does, maybe you should switch to that program instead.
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