Iphone 3GS Upgrade IOS?

[avian100]

Hello I have a Iphone 3GS running 4.1 with 6.15.00 . is there a way to upgrade to latest IOS Keeping a baseband that I can use Ultras0w with? or is it even worth it?

 

[willerz2]

Use RedSn0w to upgrade and preserve the baseband


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