I tried to solder a esplink to the router and may have damaged or broken it
I also prepared the antennas of the router with epoxy to test it on a pole during the coming summer at the ship. On the 5GHz part I got stuck as this leaves the field of my knowledge.
I think if the device would work again I could flash new experimental builds easily. I will see if somebody has any idea with this SMD part (pulldown resistor?).