Orbi RBS50 Bricked?

Hello,

I have found a topic regarding the same issue I have:

https://community.netgear.com/t5/Orbi-Wi-Fi-5-AC-and-Orbi-with/Is-my-13-month-old-RBR50-bricked/td-p/2009904

going over all the steps in the message from  pbarham on ‎2020-11-23, I could not get furhter at the step when the Orbi should re-boot. In Terminal I'm not getting the message:

Hit any key to stop autoboot: 2

Anyone an Idea on how to fix this?

I have tried to set the rate on 9600 & 115200... but nothing helps!

thanks!