Iphone 3gs no longer will work  after iOs5 update,comes up with message ' there is no sim card installed in the phone. Can anyone help me please. I am working as a volunteer in a remote location in Asia and no where near an Apple shop etc?

I have tried to  update my 3GS phone and now it longer works as it comes up with message there is no sim card installed in the phone. Can anyone help please as I am no where near technical support as I am working as volunteer in remote Asian country

Hi Allan,
Thanks for asking, I knew I had forgotten to mention something. The phone was indeed unofficially unlocked, since there were no apple stores or even premium resellers in the region I lived in during the given procedure had to be done.
I understand this could be a further complication, especially the fact the home button does not work. However, I was wondering if there would be a possibility to use a third-party application instead of iTunes to restore the iPhone? IF someone does know of such an application, I could easily solve further problems myself. Basically, the main issue here is my lack of ability to enter DFU mode.

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