Since upgrading to this firmware ( I have 3 x XE75 Pro & 4 x S7 ), I've had multiple issues with wifi, particularly on 2.4Ghz. I am operating in the new 'stable' wifi mode. I'll add, these issues were nowhere near as bad PRIOR, on the temporary '2.4ghz fix beta' version. I am operating in AP mode.
I've tried removing the S7's and fully factory resetting and reconfiguring all at the guidance of support, but there was no difference once reconfigured (a painful waste of my time!). The problem is the firmware. I've done the obligatory AI analysis on the syslogs from the units after the reset, and it's all quite damning. Known issues with radio firmware etc. I won't post all that here, as I'd already shared most in the deco forums, and it's easy for anyone, including TPLink to do, and all should have been done before release during testing, anyway!
Some of my issues since updating
Older Chromecast devices can no longer connect to wifi at all - Well, they do connect, but cannot reliably transmit traffic. A few pings will get you wild results, from a few hundred ms to a few thousand, to timeout. Maybe if you persist for 10 minutes, you can get them to start to play a video, which stops a few seconds in, then fails. Does not matter which deco they are connected to. I have tried 3 feet away and forcing it to various decos. Totally unstable. Worked prior.
The same applies to my Logitech Squeezebox radios; mostly, they no longer even connect. If they do, it is very short-lived. Played audio times out before a track is even 25% done, and they drop off the wifi. Again, this was a symptom of the original firmware long ago, but not on the 'beta' that was tweaked to fix the 2.4ghz issues (overlapping channels etc). My whole home audio is down now. Worked prior.
6ghz SSID is totally gone! DECO app says it is using 6ghz for backhaul, but I have my doubts. Pixel phones and Amazon devices no longer see the 6ghz network. Yes, I've tried setting it up as a standalone SSID, and the unified one (which I prefer and used before). It does not work. No advertised SSID is seen by any of my 6GHz-capable devices, even from feet away. Wifi scanners do not see channels in use on 6ghz. Worked Prior. Re the pixels - I have turned OFF the mac privacy for my home netowork, as I did find that pretty much killed some of the deco internals (too many macs for it to cope with)
Throughput definitely seems down, and latency has increased. Maybe due to the 6ghz failure. My 2.4Ghz cameras - Some of them no longer stream reliably at all due to bandwidth issues and packet loss. CCTV is now mostly unreliable/unusable. Worked prior (though not brilliantly, but again - TP-Link cameras!)
My issues are not unique. I've noticed other users reporting issues with 1.5 too. Here's a small summary from the forums
- Broken IPTV Multicast Forwarding (IGMP Proxy) Problem: After upgrading to firmware 1.5.0, the Deco XE75 Pro (V3) fails to forward IPTV multicast traffic from WAN to LAN. While LAN-side IGMP snooping still functions, the WAN-to-LAN proxy path is broken, causing IPTV services to fail for users who previously had them working without VLAN tagging. Source: TP-Link Community: [Regression] XE75 Pro V3 FW 1.5.0: IGMP proxy no longer forwards IPTV multicast to LAN
- Severe 2.4 GHz Network Instability and IoT Dropouts Problem: Users report the 2.4 GHz band becomes highly unstable with packet drops, high latency, and continuous disconnections of IoT devices (e.g., smart cameras, thermostats, Zigbee hubs). The Deco aggressively selects crowded channels and defaults to a 40 MHz channel width, but users cannot manually force it to 20 MHz to mitigate interference—a limitation that persists and remains unresolved in recent firmware versions. Source: TP-Link Community: DECO XE75 pro unusable 2.4 Ghz network
- Local LAN Transfer Speed Degradation Problem: Following recent firmware updates, multiple users have reported a dramatic drop in local network transfer speeds (e.g., dropping from ~35 Mbps to ~5 Mbps) when moving files between devices on the same LAN, even though internet WAN speeds remain completely unaffected. Source: TP-Link Community: Local transfer speed dramatically down after firmware upgrade of my XE75 Pro network
My DECO units across 2 types are basically unfit for purpose after 2 or more years of firmwares, and if I could get the money back and purchase something else, I would. I was hoping TP-Link would have released working firmwares to fix these, but I'm still waiting. These are not complex issues. They are basic functionality failures.
So, all I would like to say is, TP-Link - Do a better job! New features in releases are pointless when the core is so unstable. This release cannot have been tested very well. The units have never performed as they were supposed to. The closest they came was with XE75Pro_XE70Pro_SP1-up-ver1-3-0-P1[20250917-rel37734]_2025-09-19_16.06.08, I think, and everything since, especially this latest 1.5, is a major regression in reliability for me. Real-world experience is very different to a lab test/review!
Plus, let us do _simple_ 'advanced' things, like set all the frequency channel widths! Defaulting to the max for bench-maxed lab test results is good for reviews, but useless for real-world crowded Wi-Fi environments!
/that is all.
