HT201685: Find the software version on your iPhone, iPad, or iPod
Learn about Find the software version on your iPhone, iPad, or iPod
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Helpful answers
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Jun 20, 2012 4:02 PM in response to adegoyeaby kb1951,What was the error message? Was your phone unlocked prior to this update?
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Jun 20, 2012 4:17 PM in response to adegoyeaby Lawrence Finch,An iPhone 3G cannot be updated to 5.1.1; the last version supported is 4.2.1. So if you managed to get 5.1.1 on it through some means that bypasses Apple's protections you have wiped out your phone.