Unable to activate or downgrade

[errmmm]

First off, I'd like to appologize in advance for my lack of tech talk...if you could answer my question with as less technological terms as you can I'd be grateful! (On that note, I'm not absolutely horrible either)

I have an iPhone 3Gs that was unlocked and jailbroken on iOs 4.1, then I made the mistake of updating it via iTunes to iOs 6.0.2.
This led to me not being able to activate my phone (I have the original sim card-Rogers but its not active right now, if that helps)

The iPhone is (I think) still on the iPad baseband, I have tried to downgrade it, but nothing happens.

Please help!

I need to unlock and jailbreak it so that I can use my current Fido sim card.

Also, it was manufactured the 42nd week of 2010

Please let me know what other information you need...


And in advance, thank you

 

[1982ollie]

You need to jailbreak the device if not already done using Redsn0w, this will get you past the activation screen and then install ultrasn0w from Cydia. This will unlock the phone if you have iPad baseband or downgraded baseband.