Reset on iPhone 3GS not loading?

Just purchased a second hand iPhone 3GS that is jail broken. And I have reset the phone to its original settings, and it's been loading for almost 3 hours. The screen has just stayed black with the white loading sign going round and round.

Its probably because you are in DFU mode. Do this to fully reset your device back to factory settings: (THIS WILL ERASE EVERYTHING IN YOUR PHONE but not in itunes)

Plug your device into your pc with itunes openned.
Then:
Hold Lock(power button) and the home button together until the device shuts off completely.
Then keep holding it for 7 seconds(more then 5 seconds anyways) THEN release ONLY the Lock button(power button).
Wait for itunes to say that it recognized a device in "Restore mode" and it will ask you if you want to restore.
Select Yes. Wait… And enjoy you "new" iphone.

You can check these out too:

hope this helped!

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