I've been playing with it, I started with home assistant then tasmota on sonoff. Have a look it's certainly not above yours h
https://flows.nodered.org/node/node-red-contrib-home-assistant-websocket
All i can say is apply the same logic to everything else in your home. Id like to know the ages of everything else. We dont say it needs to be replaced to do what you want for profit to us, your here posting no-one is making any money. You still have an old system none of us here would have in our homes. I moved into a house with ts 900 10 years ago. Its gone. I have a v2 hw 1070 now a 10270 due to firmware upgrades. When i cant upgrade firmware i get rid. This is the bit of kit i trust to protect my home and all around it (granted its linked to HA)
When first powered up its in a test mode showing open circuits. Once you clear them all it will then go to rest / day mode.
One option is to remove all circuit wiring (marking up first and take a photo) then link out all to prove the panel. If the panel functions with all circuits, tampers etc closed then you have a base point to start from
on power up from new (if you reset it then its the same sort of thing) it will show active circuits till you press a button etc. Whats concerning me is the fact its not accepting the default code. If its that old it wont have an engineer code. Just the user code.
It is knocking on though an optima compact gen4 isnt exactly much.
Old yes useless maybe not, worth spending much time on, no. But depends how much you need it and how important reliability is. Is also god a horrid cheap battery on it that certainly wont help if it was ever 2.2Ah id be astounded