Goldstar PBX / Model GSX-208 Basic - Newbie help

[juanchobar1]

Hi everybody, just been browsing your forums looking for some help if possible.
I have a GSX-208 Basic System that I decided to install at home after 5 years of garage storage. The backup battery had gone dead so I changed it but the main problem is that I could´t find the manual. I´d have to re-program it for sure but I don´t know how to go on.
Does anyone have a clue about it?
Best regards
JB

 

[juanchobar1]

I forgot to mention that this model has 2 exchange line leads and 8 telephone extension sockets.
Thank you.
JB

 

[juanchobar1]

Model GSX-408 would do too.
It seems to be the same as the GSX-208 but with 2 more CO lines.