trouble with Paradyne Bitstorm 2600 DSLAM

Hello, all!

I have Paradyne Bitstorm 2600 DSLAM, but no password. Is it possible to
reset this device to factory configuration? Manuals don't say much, only
specified way to restore factory settings assume logged in


Thanks. I have already tried interrupting boot process. Booting up with
parameter 0x00020 (disable login security) don't seem affect outcome,
both serial and management ethernet still asks login.