Here is the procedure to recover the password on the 3510:
1. You will need the serial null modem cable that came with the 3510. Connect it to the serial port on the front of the MCU and the other end to your computer.
2. Launch Hyperterminal and select Com 1, then change the video bit rate to 9600 and flow control to "none". All other settings are default.
3. Hit the key combination Control-X to reboot the MCU (or just power down and power up the 3510)
4. When the device reboots you will see trace activity in the Hyperterminal session then you will see "press any key to configure". Press a key and you will see a menu with various options. One of the options is password. Here you can set the password then the system needs to reboot.
