iphone 4s jailbreak/unlock noob question...

knoc24 Posts: 5
edited June 2012 in Jailbreak Forum
so i have an iphone 4s its already unlocked and jail broken thats how i purchased it. specs are.

Version 5.0 (9a3340
carrier AT&T 11.0 but i want to use it with T-Mobile
Modem Firmware 1.0.11

What do i need to do to update to the latest Version? Update my phone to 5.1.1 and then use Absinthe 2.0 and re-jailbrake and will my Modem Firmware being 1.0.11 an issue? Will i loose my UNLOCK if i do this?

again sorry this is the 1st time i deal with this kind of stuff..

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