No, with this firmware it finally works. Before when the router left the range of the accesspoint and came back into the range of another one, wifi didnt recover. Now it works!
I tried several firmwares also RUT9XX_R_00.06.00.2 on the advise of the responses in this forum. Look for example at my post "https://community.teltonika-networks.com/3331/rut-950-wifi-gets-stuck" under Rut950. So i will not touch firmware anymore.
I need now a way to downgrade existing installed routers, so that they are accessible after the process of downgrading through VPN or something else, so that i can connect and change settings completly as how the where before the downgrade and be usable as PLC gateway for Softwaresupport of our machinery.
example to see why and feedback:
The router we found working ... it was at "Timphu" ... a place that i dont even know which country it is from, and i dont wanna find out.
I just gave feedback on how the issues before where to be solved correctly... by downgrading instead of trying dozens of new and newer firmwares, during a running 360° testing. (Which our company unfortunatly started to perform on the devicetype, when devices where already installed and away)
So that described critical issue is not a problem anymore. I need to do downgrade and setup, without loosing connection to a router in for example india.