Upgrading to 3.xx questions

[manic111]

I am looking at upgrading to the final version of 3.53 from the Korean website, but have a few questions first.

1-will it set my player's language to Korean? If so, how do I change it back to English?
2-I obviously can't follow the Korean installation instructions on the website-does it install in the same way as the English language releases?
3-I assume the dictionary is in Korean and therefore not much use to me. Is there any way of wiping it from the menu?
4-If it all goes wrong can I go back to 2.xx firmwares, or is it a case of "once you go to 3, you are stuck with 3"?
5-Aside from the usual firmware bugs, will going to 3.xx cause any problems or conflicts with the player? Is anything inbuilt to the European players to prevent downloads of Korean firmwares?

Thank you!