I just got my 500 and having the same problem and questions. I tried the Korea/English swap as described on page 1 using the 2.002E firmware and it did not work. Anyone get this working more recently? Anyone have the old 1.005E firmware? The links in this thread are broken...
Update: I found an old 1.005E online and followed all the instructions. It did not work. After I changed English to Korea, after I plugged it in, it unit overwrote the SD card with the 2.002 Korean firmware. Then changing it back from Korea to English did nothing good.