Cannot access my Iphone 3gs after upgrading to 5.01

Hi,
I bought an unlocked Iphone 16BG 3Gs from eBay. I used it for a week
TillI connected my Iphone to ITunes and they notify me I needed to upgrade my
Software and I accept.
That was the mistake I made as it upgraded to 5.01 and I cannot access
myphone. When I put on my phone I am getting the activation screen. I try completing the activation but with no success. When I connect my phone to USB and start Itunes I am getting error message
"There is no Sim card installed in the Iphone your are attempting to
activate"
I tired the following with no success.
Itried downgrading from 5.01 to 4.33 by downloading firmware from google. Holding shift button and clicking restore onITunes, selecting the firmware but I am getting error message" Iphone“Iphone” could not be restored. An unknown error occurred (3194)
I also tried using RedSn0w program and Tiny Umbrella and no luck at all.
Please help.
Thanksyou,
Charles.

Is the SIM that is installed from the carrier the device is locked to?
Was the device hacked or jailbroken? Possibly to unlock the device?

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