I have a BT video 1000 and a 6000. The 1000 parent unit finally broke last night after 6+ years so Was looking to replace but saw on a different thread that it should be possible to pair the 1000 camera with my other 6000. I have gone to pair new cam on the 6000, held down both volume buttons on the 1000 until they flash, but nothing happens and the 6000 beeps at me after 30 secs. I’ve tried doing it the other way around too. What else can I try, please? Or is it just not possible? Trying to avoid buying a new unit!