Downgrade to 4.1 with shsh blob then upgrade to 5.1 without shsh blob?

Hello friends i have iphone 3gs ios 6.0.1 installed i have SHSH BLOB for 4.1 ios of my handset if i'm downgrading my handset to ios 4.1 with shsh blob after that can i install and upgrade to ios 5.1 without shsh blob? I have new bootrom. And unlocked 3gs

Send me an emil at stefan_zxcvb@live.com I will explain everything

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