@Vortex - So you need to find something that will convert an EPUB to a genuine PRC- all I could see from a quick search was Zamzar.
As I see it µBook hasn't kept pace with e-book technology, if it had then it would be able to render EPUB, MOBI and AZW3 directly without need to convert to legacy formats like PRC and RTF.
You could make a post in the plug-ins ideas thread to see if anyone is interested in doing a 'real' PRC Output plug-in or updating the HTMLZ or RTF Output plug-ins to put covers and TOC in the output. Or you could do it yourself or pay someone to do it.
But I think you've exhausted all the avenues in the current version of calibre.
BR
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