help, some i have a 2g touch some apps not syncing after jailbreak

My ipod is displaying that I am using 2.0 firmware, which I think is why some of the apps are not syncing, but I used the source on this tutorial for firmware(http://www.youtube.com/watch?v=WwACeHzRXgg)I think this has something to do with me using FWchanger to try to download different apps but I tried deleting it. can anybody explain how to fix this?