need help downgrading

ok first off love forum , iv found answers alot of problems here
second im new
third want apologies in advance if topic has been discussed already



got myself iphone 4 yesterday not 4s 4.
accidentally let itunes upgrade ios 5.1 , jailbroke cydia not work , when open wont let me search nor let me add repo addresses.
need downgrading 5.0.1 5.1, iv found online using ifaith but! have mac , ifaith pc!
can me please!!!!!!!!!!!

 

download , run tiny umbrella.
plug in iphone , click save shsh.
list blobs have available. if lists 5.1 , not 5.0.1 never able downgrade again.
, try not "accidentally" update next time.

 

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