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I don't know about the issues with CBR files as I don't have any, however I have also installed 2.8.1 on my Touch (B model) and Mini with out any issues. I had 2.6.1 on the Touch and the issue with images not being displayed in EPUBs was driving me nuts, downgrading to 2.5.2 would require a device reset and that version had issues with the covers being blank (though calibre can be made to load cover images to over come this defect). In any case I was tired of the lack of progress on any new firmware coming out for the touch, read about other people upgrading to the newer unsupported version and thought what the hell, and did it.
I am sure 2.8.1 has defects (again I don't have any comic type files so I can't comment on their function) however at least now I can have a working cover, and working book images. I suppose if you want to play it safe and if you have the Touch B or C, remove the back and clone the SD card, and do the same for the Mini (while you have to pry the touch apart, on the mini once you remove the snapback, you just need a Phillips 0 or 1 screw driver to remove the six screws, the white (or black) back panel just needs to be gently pulled away from the tabs on the bezel. Do a search and you can find detailed instructions of how to deal with the microSD card. Hey it is also a good excuse and chance to increase the onboard storage of the mini since it lacks an external memory slot.
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