How can I determine if my IPhone 3Gs 5.1.1 BB 06.15.00 can be DOWNGRADED?

sew600i
sew600i Posts: 2
edited July 2012 in Unlock forum
Hi guys, I just need some help regarding for my IPhone which I updated to iOS 5.1.1 and unfortunately the baseband was updated to 06.15.00.

and as of now I can't unlock it using ultrasn0w 1.2.7 ..

now I want to know if my phone can be downgraded without messing/bricking it up.

The serial number of my phone starts with 84005 ...

pls help me how to determine if I can downgraded it because i am thinking that if ever i downgraded it i can surely unlock it thnx .. !!

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