If anyone is having same issue that I had, I can confirm that there is no problem. I just cut Internet connection and 5.05 installed properly using the method from tutorial.
Thanks mate, I will try to delete 5.55. Better to be safe.
Update: Is there any tutorial about how to delete patch file? I found only those for already jailbroken consoles.
I already have patch 5.55 file downloaded but not installed. I am currently at 5.03. Will 5.55 file affect process? When I put USB with 5.05 file it is reading it, but I don't want to accidently to go beyond 5.05.