Phone constantly restart after update to 4.5 firmware

I updated the firmware from 4.2 to 4.5 on my Blackberry 8800. After that, it constantly restart. If I press "back" key before "Loading programs" messages, sometimes work. But, few minutes later restart again.
If I connect the phone with my PC, it keep on and work fine, but if disconect it, constantly restart again.
Please, could you help me? How do I solve it? The phone is barely useable after the update. Is it possible to downgrade the firmware or reinstall?
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