Flashing Openwrt to Netgear r8000p

Hello,
I need to know about the pins for console flashing. I have an USB to ttl, but I do not know where to connect ground tx and rx pin connector. Does someone have knowledge about.
Sry about my English.

thx

DC

Are the R8000 and R8000p same device?

https://www.myopenrouter.com/article/how-set-serial-console-netgear-r8000

I think I have to try out.