:^/ I've no experience with GSM, but in my CDMA experience, codes begining with # and * and dialed at the dialer interface, and require that the radio be on. To hard reset the Treo, one holds the power button down while replacing the battery. Once the unit has power, you'll get a prompt to reformat the cell phone to factory specs.
:^/ In your place, I'd recommend taking the battery out, then expirementing with holding different combinations button when restoring the battery. For example, the power button, the volume buttons, the call end button, etc
;^/ Let us know you get along..
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