I have no experience with hacking Sony devices, so I don't know if Russification would cause problems with the reading application. I do have experience with broken epubs that cause the reader to stop responding, on all of my ereaders (Sony and PocketBook). I watched one occur the other day on my PocketBook Touch Lux. The reading application (based on Adobe RMSDK) starting using 100% CPU and eating up all the memory (I watched it via a telnet session). I guess it's not easy to design epub reading software that can handle every kind of brokenness in the document.
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