I just got basic permissions on the forums an hour ago, and I can finally post links.
If you do decide to go the route with ChanSccpB there’s a specific wiki page for FreePBX https://github.com/chan-sccp/chan-sccp/wiki/FreePBX_Installation, follow and read the instructions as some are optional such as installing the DHCP server etc.
I don’t recall being asked for a password however the wiki I linked was written by @cynjut. I’m relatively new to ChanSccpB so I can’t provide much assistance, i switched to it after trying for about 3 days with my sets in SIP mode
Password wise sometimes with MySQL try blank
You might have to create a custom sip model/change the boot load info on chansscpb if you are using a different firmware then listed as all that comes installed is the other models and the 7960