i don't know what to say but thank you very much mamu for your tools. i really thought it is not possible without a proper cri tool. i have tried a lot with this cpk and was very disappointed that it didn't work.
now i can play the japanese one even in english and maybe undubbed.. only the eboot has to be translated now
if someone is still tryin to translate the japanese eboot, i can recommend the app "MadEdit". it is the only hexeditor so far i've seen, which can handle shiftjis onboard. though it is a lot of work and i am not very confident at the moment.
at arktos: most of the eboot is already translated. i played a few hours into the game and so far only a few non trivial things are still in Japanese.
at mamu: i can't seem to get the GUI working... keeps giving error on repack.
at jadekitten: try decompressing the rootR.cpk you make with original unpack script of quickbms first. saves you the trouble of going all the way to ps3. also try doing the same process in another pc if possible, sometimes windows just goes nuts and wont do anything in order, happened to me a lot over the years =p.
mamu earlier stated that black screen might be because of missing file. so far. infinite loading meant bad cpk. so it might not be your cpk at all. maybe try to ftp it from scratch again. be sure the correct map0, map1, rootR and eboots are on it.