upgrade to 5.1.1 while preserving baseband

[ineediphone]

Hey everyone, i have an iphone 4 jailbroken with version 4.1 with modem firmware 02.10.04. i want to upgrade to ios 5.1.1 while keeping the firmware the same so it remains unlocked. i used sn0wbreeze and redsn0w and even iREB, but after getting into pwned DFU mode, and opening itunes and shift+restore and clicking the custom ipsw, itunes tells me an error 1601 or 1602 has occured. can someone help me with this? any help is appreciated. thanks

 

[TriJetHero]

Your host file is still pointing to Cydia instead of apple.

Connect phone to usb
open TinyUmbrella
In the advanced tab UNcheck Set host to cydia.
Close TU
On a windows machine restart computer

Now try again with your custom firmware and pwned-DFU

 

[ineediphone]

the set hosts to cydia box is already unchecked, and if i were to try and check it, the box is grayed out, i cant do anything to it, any suggestions?

 

[ineediphone]

actually i got it to work, and the baseband stayed the same, and while trying to jailbreak it, its now stuck at the apple logo, any suggestions?

 

[PsstGreek]

Did you follow the countdown correctly? Just try again.