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Want Unlock iOS 4.3.1 on iPhone 4/3GS using Ultrasnow and Ultrasnow fixer? For your kind of information that Ultrasnow works only for following baseband: (01.59.00 / 04.26.08 / 05.11.07 / 05.12.01 / 05.13.04 / 06.15.00). But remember you must restore custom iOS 4.3.1 while preserving the baseband.