As far as I know, there is no upgrade for the psjailbreak. There is an upgrade for the file manager. that is a PKG file. You need to put that file on a memory stick (fat32) and install that PKG on your PS3.
Perhaps you can clarify you question by telling us what files you have? And exactly what type of jailbreak device?
Let me first explain the 3.41/3.50 situation: Your PS3 should always be firmware 3.41 (or lower). This update allows you to play games that require 3.50. If you PS3 is version 3.50, you cannot use any jailbreak.