Dude33 If you do a reset and then wait until the LED on the IB is constantly white again and without restoring the old configuration, then you won’t be able to access the GUI? It may be that the old configuration has a problem. As I said, there are no known problems with the IB3 and 15.00.46. Therefore, the hotline is not burdened by this ;-)
If none of this helps, then the hotline should install 14.xx.xx again. If it then works again, then something in your setup seems to be triggering a bug in 15.00.46.