1. the code is encrypted with 128 bits. the code is impossible to get like wilhel stated.
2.same thing
3.the modchip is capable for dual boot . you can flash new firmware whenever.(except for ta-82-86 boards, i think)
4. i dont get your question. do you mean to trick the version to 1.00 and update to 1.5? because that will brick.

good questions!

__________________