First of all let me express my gratitude for you spending that extensive amount of your personal time for helping people on this forum.
The amount of knowledge and documentation shared here was one of the things that leaned me towards buying this robot. As a clarification - I'm a hobbyst and this robot was bought as scrap, probably for less than metal costs. I keep it (and and old Fanuc S430iF) in my garage. Pure intent of this is to learn more and educate myself. So if it works - great, not - well, still worth for learning things!
I was able to reset the controller. Also ordered a new battery for the controller and for the robot, it looks like the robot has an aftermarket battery that is still ok (3.6v), so I guess it was replaced at some point.
The sticker inside says:
Date: 2007.5.31
AS Software: AS-0281040G
Servo Software: SV-0400001J
While I personally never saw it moving, here it is:
It is exactly this robot, that is moving in the video.
Of course there is no warranty something didn't happen to it after that.
Just according to the staff it was diconnected from power 1+ year ago, because they got new ones coming.
Once again thank you for the amount of efforts you are investing into this forum.