@Joseph-TP Hi, thanks for answering.

That's not the case, my EC220-G5 is not tied to any internet provider, I bought it in a known store. Also, I am able to flash the firmware listed on the same link I listed above, which I understand is the lastest.

The visuals are somewhat alike, some with more or less options. Just to give an example, the manual provided in the EC220-G5 support page mentions this device as "TP-Link AX router". Operation mode menu shown in the manual (pg. 18) lacks the option "Extender", just displaying "Router (current mode)" and "Access Point", while my router actual menu has also a third option, which I use, called "Extender". Also, I can't find any EasyMesh option in the actual firmware.

  @dplc81 

Hi,

As far as I can tell, on their home routers TP-Link makes the DFS channels available only on models that support 160 MHz channel width.
 

  @woozle Hi! Thanks for the attention.

I can understand DFS not being available for the extended/repeated network, and that would not be a problem, being a product specification.

I think my first post was not well worded.

When in the Repeater/Extender mode, EC220-G5 v2 is unable to "see" the main router 5G network when it is using a DFS channel (between 52 and 144). When the main 5G network uses something like 36 or 149, for example, EC220-G5 automatically connects and "shares" the 5G network. Frequently the repeater is working, and suddenly, whenever the channel changes to a DFS channel, the repeater stops working (and 2G network will not assume without manual intervention).

I don't want to set a non-DFS channel in the main router because I want it to choose automatically the best available channel, be it DFS or not.

Also, all my old devices devices like phones and laptops all are able to "see" the 5G network in whatever channel it is, just my router EC220-G5 will not "see" the network. The 5G is simply delisted from the detected signal when I configure the router.

I'm also studying to test OpenWRT firmware, since I found out my model is fully supported (V2). Anyway, it would be nice if it would be fixed in the official firmware (if it is a real issue, and not just a product limitation).

  @dplc81 

The operation mode doesn't matter in this case. TP-Link's router models that don't support using the DFS channels do not support them in any mode.
Besides, Wi-Fi extenders/repeaters use the channel they use to connect to the host network also for the extended/repeated network (of each frequency band). I have not seen one that works differently.
So it would be very confusing if the router in "Extender" mode could "see" Wi-Fi networks that use DFS channels, but then not allow the user to select any of them.

Provided the hardware inside the EC220-G5 V2 supports DFS (which I am not sure about), then OpenWrt should allow you to use the DFS channels.