Grisu
Part of the Furniture
did you try with only PC to modem LAN-port ethernet connection?
Set fix IP to your PC LAN port (192.168.50.10) and start restauration tool as admin, search firmware you want to load but dont start searching for router, now press reset button on router >10s and start search on PC.
Set fix IP to your PC LAN port (192.168.50.10) and start restauration tool as admin, search firmware you want to load but dont start searching for router, now press reset button on router >10s and start search on PC.