The link https://www.tp-link.com/us/support/download/deco-p9/#Firmware shows the latest version to be 1.1.0 Build 20200513 Rel. 52023, and I installed 1.1.1 Build 20200812 Rel. 46656 yesterday after...

@hakmusic I'm a fan of PowerLine for when you can't run an ethernet cable. I was using it when wifi wasn't that good to put my main computer on the second floor onto a wired connection, or when a...

@monahancj Rebuilding the network worked mostly. At 375/450 down/up the download is slightly slower and the upload is back to normal. @Tony, thank you for the help. TP-Link, do better, please.

@Tony the only change was the firmware. The computer testing is all wired. computer -> cat 6 -> gigabit switch -> cat 6 -> main P4 -> cat 6 -> Verizon FIOS ONT I bypassed the switch, computer to P9,...

Before the firmware update I was getting around 410 Mbps down and 450 Mbps up. Now it's usually 225/200. I tested the line by plugging PC straight into the internet connection, bypassing the P9, long...

@PDXJD I couldn't find the link again, but when I was researching this I found an article show technical electrical things I kind of understand that showed how surge suppressors can block the...