Change game difficultly after starting game?

[Ahmadi]

Hi
In another thread i mentioned that games go impossible after migrating from first island, however i started the game in "Hard" mode, i want change it to "Normal", i think this can help me a few(15%) for playing the game, because the game go harder automatically and i did wrong in start of game that i choiced "hard".
Is it possible that i change game difficulty with hex-editor or text-editors(changing my profile directly or other ways)?
I don't want to replay the game from zero, because its some days that im playing !

Thanks for any help.
H.Ahmadi