I thought someone might be interested in replaying GO games in SGF format on his/her V3. For that one has to flash the device with this V3update.bin and put the sgf files on the SD card, adding to the extension .sgf ".prc", so the filenames would be "bla_bla.sgf.prc"
The modified firmware can be found here
The whole thing looks like this
Also with the modified software epub-, hmtl- and chm files are handled with FBReader which displays them much better that the original plugins.