This is my router image and I couldn't find the UART port for the router. In the pcb it was written as UART_in but no specific port. There a small metal antenna connected and I what is that one for?
Assuming that we are talking about a TP-Link Archer C6 v2.
See https://openwrt.org/toh/tp-link/tp-link_archer_c6_v2#serial
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