Hello iPhoniatico if you could not resist or mistakenly upgraded to firmware 3.1 because here the solution to downgrade
Works on 2G and 3G Iphone
We joined iTunes and connect iPhone via USB.
Turn off the iPhone and put it in DFU mode
iTunes will recognize DFU Mode on your iPhone.
Press Option + Click Restore (Mac) or Shift + Restore (Windows)
For Firmware 3.0 and press the Restore (We will fail (1015), nothing happens, it is normal)
IRecovery Unzip and open the terminal on MAC or Windows Comand Prompt and type the following (in the terminal you get in the folder where you downloaded iRecovery) iRecovery-s
Once entered the recovery mode, type in terminal: Fsboot
Once the iPhone restarts you will see that you can only make emergency calls so you just have to activate it again and you have firmware 3.0 on your iPhone.

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