Does anyone know if there is a 5.03 software for the Korean systems or Europe system?

5.03 like all firmware works everywhere, you just select your country.
I got it from a member in North America and have it running on systems in Australia.

It's available on OS7030, OS7100 MP10a, OS7200 MP20, OS7200s (MP20s), OS7400 MP40 (SD/MMC Card variants)