jailbroken iphone 4 running ios 4.3.3

4i2fly

i've been trying to upgrade to ios 5.1.1 with no luck...i get number of errors with or without host file (mac osx) mods ranging from 21 to 1600 and 1601. is there a way to upgrade to 5.1.1 without apple sign on, or is it possible to fool the device so it can go ahead and restore to 5.1.1? i appreciate your reply.
cheers,
matt

jery2109

use redsn0w