Hello Devam - thank you for your answer!
I confirm I am in advanced mode. I reloaded the new firmware. When doing Network - Wireless - Scan, I am asked to "Join Network". Then I am asked to give it a name, indicate a mode, ... Any additional indications on how I should set this up?
On the package upload, no progress. I still get the error that the package is not compatible with my firmware version.
On the slide-out menu (arrow upper right), with the choices of "Wifi - RMS - Mobile", pressing "wifi" still sends me into "reboot-land" as the router is suspended.
With thanks!