My friends in the service industry use some boxes from CelleBrite to fix such things. Given the cost of the phone I doubt you will buy this tool.
Bob
I have a Curve 9300 and yesterday it hay a error507 reload software message, which I did today, and it's back on, but the has a "device is locked" message but gives me 'unlock','emergency', and 'cancel' but it doesn't give me the chance to put my password in

Chowhound
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