Ios 4.1 upgraded - doesn´t work in Brazil - need dowgrade to 4.0.1 - how ?

guys,
I bought an iPhone4 in Canada - the original version was IOS 4.0.1 - putted my TIMBRASIL simcard with my local phone line and worked fine until something be strange and locked in white apple logo...
The only thing able to do was upgrade to IOS 4.1 --> my local line was gone !!!
How can I downgrade to IOS 4.0.1 or get IOS 4.1 working with TIMBRASIL ?

Where did you buy it in Canada? If you bough it directly from Apple, at full price, with no SIM card, then it should be unlocked and work with any SIM, even after updating to 4.1. If it was bought any other way, it was locked to a Canadian carrier. It may have been unlocked by jailbreaking, but if ever updated, would lock to its original carrier. In that case, there is no way to downgrade or unlock it.

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