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The PRS-650 (maybe all Sony Reader products) have two file size requirements that need to be adhered to for an epub file to load successfully. Every file within the epub container must have an uncompressed size < 300 KB and a compressed size < 100 KB. The size of the epub file itself (which is really just a zip file) doesn't matter. Your epub probably contains a file that violates one or both of these conditions.
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