I have a concern: Is it better for gaming to enable flow control and full duplex speed in my router?

I've subscribed to WTFast a bunch of times, but it's just not working for me. I even reached out to their team, and they think it might be a firmware problem with my GE800 TP-Link. I'm writing this...

@Vendex I can upload US firmware manually to my router (EU version).

@Kevin_Z Please provide the link for manual installation.

@Vendex Yes, same to you. Still, I didn't receive the new firmware.

@Pro-gamer From your experience, which MTU is better for us in our situation: PPPoE in PS5?