Downgrade iphone modem to original factory setting

I tried to update the firmware 3.0 beta version and it was a success, then the OPTUS 3G signal was lost....my phone was locked. How do i unlock my IPHONE???

There is no sanctioned way to downgrade the modem baseband after installing the 3.0 beta. This was clearly announced by Apple when the beta was released to the developers. (You are a developer, right?) You can try Googling for unsanctioned alternatives which will void your warranty and are of questionable effectiveness.

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