Full fibre ONT installation, router moving to different room

[yakyak]

Thankyou for all the suggestions and no problem with router password being viewed, windows are onto totally private courtyard, no pubic access.

[yakyak]

Sorry, should have explained, older PC doesn't have wifi, that is the basis of my problem 😉 So when I say wired ethernet needed, only needed to connect the older PC. Can be a wifi to ethernet adapter. I do have a long ethernet cable, can run that temporarily and it may well become permanent!