Mike,
I've been busy with the R500's and it is working.
Just reflashed it again with the standalone version (100...) with default settings, which means the US radio setting as default. Now, I live in the Netherlands so the Dutch setting was the one to choose for me during setup. The Ruckus is an US version according the sticker at the back. So. the stand alone version was working after enable networks on both 2,4 and 5 GHz. While this was working I reflashed the other AP the same way, and after the configuration like the first one this was working also! Now I knew that both AP's were probably OK.
After this, I reflashed one AP to the latest Unleashed version (200...) and left the default settings as it was. After some time it came up and seems healty and I saw a AP presenting itself in the configuration! Got this one working, en did the same for the second AP.
Now they are both seems to be healthy, one as Master and the second one as stand-by Master.
Everything is up and running now.
Thinking how this all happend.. I changed in this working setup the Landcode from the default US setting to Netherlands. After restart, no WiFi network was working. Don't remember if a AP was visible in the webconfiguration. Put it back to US and there we go. It was working again.
Conclusion: This 'Radio Landcode' setting together with the use of Firefox in stead of Edge (I use Windows 10, so the default browser) was probably all it was and the solution. Maybe browser caching? Edge acts strange sometimes with this kind of configurations for routers, AP's, switches..end so on.
Now I have a final question: Is it possible to change the Radio Landcode to Netherlands and get the AP's working? What is the difference anyway.. frequency or channels, radio power?
Thanks in advance