Rooted, then unrooted itself, now no recovery to root again?

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http://androidforums.com – Hey guys, i rooted the samsung galaxy Y using the Update.zip and using the recovery mode ( stock i do believe ) but after using some root apps i it said that i didnt have root permission? so i tried to go back into stock recovery (holding power, middle button and up key) and it wont go in there? :/ UnlockRoot doesnt work either... any help? thanks, Jack (General)