Updating OS on unlocked 2G.........Steps??

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Hi,

I've done a lot of reading already on this subject & there seems to be a lot of conflicting info. One guy on this forum suggested that Apple no longer updates the baseband on the 2G, so not to worry about unlocking it. Does this mean that I can update from iTunes and because the baseband remains the same the phone will remain unlocked? To me, that sounds unlikely.

Here is my current setup:

iPhone 2g 8GB
Version 2.2.1 (5H11)
Modem Firmware (baseband) 04.05.04_G
Phone unlocked & Jailbroken
Current provider is Tmobile


I want to upgrade to the new OS to get the new features such a landscape texting etc.

iTunes installed is 9.0.2.25
Firmware upgrade will be to Version 3.1.2

Question: Considering the above, what combination of tools should I use to achieve a successfully unlocked iPhone on the new OS?
I'm using a windows PC.

[i.Annie]

Baseband does not upgrade for 2G phones. Any jailbreak mishaps are due to user lack of knowledge or inability to read tutorials. If it were the case to magically upgrade the baseband for 2G blackweather by geohotz is the solution. Hit upgrade in iTunes, download blackra1n, then run blackra1n. Easy. It will unlock and jailbreak the new fw and bb. After blackra1n successfully jailbreaks go to your iPhone, run the blackra1n app then select to download Cydia and/or rock and the unlock (if you're convinced your baseband has been upgraded) then proceed. After all is done run the app again then select delete blackra1n. You're all done it should take less than 5 minutes (minus upgrade time). Btw if this all fails for you it's not a baseband issue blackra1n has been reported to not work for some 2G phones. You'll just have to try and see.