[Q] can this phone be decrypted?

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http://forum.xda-developers.com – i encrypted this phone to let my brother have it now i wonder if i can decrypt it or will it now forever need a password to be used? or will the encryption dissappear as i do a hard reset? i know the password but i want to remove the encryption i encrypted it to make my files even more hard to retrieve now i am worried this encryption is permanent is it? (HowTos)