What do you mean iOS under 200If you do everything right, and dont mess with ios under 200 you'll be fine.
And just to be safe, make a nand and ios'es backup.
So will it work on 5.5.0?Follow this guide: http://gbatemp.net/threads/full-vwii-softmod.339899/
Just make sure you read it carefully and follow it to the letter.