@Andy611 If the disconnected connector is still there it must be disassembled to see which color wire goes to which pin (1,2,3,6) Connect the wires to an RJ-45 KeyStone Jack. The wires come to...

@Dahu Broken cable repair

@aboninski If the switch modem is bridge mode then router B (and router A) must be router mode. Another way is connect AP router B to Main router A.

@Bruce67 Yes, center is positive.

@Dyfon Archer AX73 with connected RE605X WiFi 6 Range Extender, random reboots

@Beardamo