Internal battery needs disconnecting aswell
The internal bell maybe Sab type so may need battery disconnecting in that to
Most external ADT boxes are dummy but few are live bells but it should due after 20mins anyway otherwise have ladders ready
You could flash the software , but unlikely your going to be able to do it yourself
I assume panel was cheap, and what your protecting isn't worth much?
Sorry got confused
My point was ee and O2 cause problems viewing on ipolis app
You can use a free vpn app but you need to manually switch it on before app then start ipolis app and it will work
Just means alarm was knackered well before you decided to look at it, and walking around not realising many bells have comfort lights
You do know what your doing right?