My iPhone 4 cellular communication stopped working after iOS 6.1 update

My iPhone 4 What's working pretty fine before updating from iOS 6.01 to 6.1.
Now it stays searching endlessly for network without success.
I have tried first to restore iPhone
Then a restore from backup
Then a new restore from factory settings
The problem to find network remains.
My iPhone 4 was bought originally unlocked from an Apple store so it can work anywhere around the world.
It was working pretty well under iOS 6.01 in Brazil and after update it doesn't work anymore.
Any clue of what is happening?
Thanks,
Fernando

It sounds like you're aware of this (regarding error 1604), but just in case:

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