Is it OEM customized device ? If yes, you need to ask the appropriate OEM for default password. If you don't know, the Cisco support should tell you (based on adapter's serial number).
This is public forum and we are volunteers only. We have no access to Cisco internal database, so we don't know the particular device has been OEM customized or not.
If you can access WWW UI of adapter, the Customization state is shown here.
As long as it's not OEM customized device, the default password will work past reset to factory default, so I assume you have customized adapter.