I have an iPhone 4, with 5.0.1 jailbroken - I want to update it to 6.1 using evasi0n but also keep my unlock which is through UltraSn0w. My baseband is 1.59. What do I need to do in order to keep the phone unlocked? I have my SHSH blobs saved through Cydia as well as TinyUmbrella. Thanks for any help!