Upgrading iphone 4 to 6.1.2?

I have an iphone 4 on 4.3.3 and it went into a recovery loop and won't come out of it even though i tried ireb, ifaith, and tinyumbrella. I don't want to lose my jailbreak and itunes won't give me any option but upgrade to 6.1.3 which can't be jailbroken and will upgrade my baseband, which i also don't want to do because i use gevey sim for tmobile. I tried to upgrade to 6.1.2 with sn0wbreeze and that kept giving me an error (11, 1600, and a few others) on itunes. So what should i do if i want my phone jailbroken, restored, and the same baseband i have now? I can't use the shitty flip phone i'm using right now i want my iphone back!

Apple stopped signing for 6.1.2
you will get 6.1.3 whn updated, you can use redsnow to go back to 6.1.2 but i'm not sure if it changes the baseband.
if its a att iphone 4 call and see if the will unlock it.
if not pay $20 and get it unlocked thru the net

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