serious problem unlocking phone

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http://androidforums.com – I'm going to try and cover every detail I bought a used htc inspre 4g online, i dont know the history of the phone, don't know if it was rooted before and a cant contact the guy who solud it to me in the hboot the phone displays ACE PVT SHIP A-ON RL HBOOT-0.85.0024 RADIO- eMMC-boot Apr 12 2011,00:55:45 the phone´s original carrier is at&t so I bought the unlock code online, I turn the phone on and enter the 8 pin code and a messege apears saying that the phone whas seccesfully unlock from network and that the phone need´s to restart, but when the phone rest (General)