Hello Everyone,

Its my first post in the forum. I am a network administrator in an Educational Institute. I have 10 Omada switches and 3 Omada EAP660HD. I run a Omada Controller in a Linux Server. The problem I am facing is very unique I think, its about EAP660HD, Hardware Version US 2.0 and from my experience, I am quite sure It's hardware or firmware issue.

One of the three EAP660HD Hardware Version US 1.0 and two are EAP660HD Hardware Version US 2.0. I have created few Wireless Profiles in the Omada Controller, Hardware version US 1.0 is work fine on everything but EAP660HD Hardware Version US 2.0 are not backward compatible with WiFi version 4 and WiFi version 5 devices on 5GHz. 2.4 GHz works on everything. I have tested it many WiFi version 4, 5 & 6 devices including Android Mobile and Laptops.

I reset the AP to factory default, Put one AP under the controller and other in standalone mode, changed 20MHz and 40MHz DFS and Non-DFS channel, put mode in Auto, manual everything, used all Mixed modes supported by the AP but none worked with Older Wifi 4 and 5 devices on 5GHz band, it only works on newer Wifi 6 devices. I mailed the complain to TP-Link support but they have not answered it yet. I thought some of you guys might have the same problem and might know any bypass solution unless TP-Link provide me any solution.

It would be a great help if anyone can guide me how to solve the issue. I was testing these devices before i deploy another 15 devices in the institute. If I am unable to get the newer version of devices work with older devices, I might stop the new purchase or buy only  Hardware version US 1.0, which is known workable device for me.

Thanks in advance

Lintush