iPhone iPhone 4 + iOS 6.1 + Evasi0n - How to keep unlock?

[OMGitsShan]

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!

 

[tjlazer]

Go on eBay and buy a cheap unlock service. You send them your phone imea and they hardware unlock it from the factory forever.