Giggling like a baby right now!
You know what's funny, I was going to write a long post about how this device is absolute garbage. I bought it 3 days ago and it worked horribly even with the Ps5 hardwired and me being a meter away from the router.
Well, I found the problem. The router itself.
I pulled out my old router from my previous ISP. Even though it's ISP provided, it's larger and heavier (=better quality I guess). I previously used to play on chiaki using it.
I connected my main router to the old router (by changing the IP address by a number, the nerds will know what I'm saying) and basically made it a mesh extender. I then hardwired my Ps5 to the old router and voila, it's butter!
The craziest part of all this, I was about to return this device within a few hours. It's 4 in the morning here. I decided to try something one last time before saying bye bye.
I was about to hate on all of you for lying. Ironically now I will be the one spamming "get a better router" to all the newbies.