No Internet via IPv6 in TP Link XC220 G3v V2 in Mobile Devices.

URGENT HELP NEEDED

From 17th Feb, I started getting IPv6 and IPv4 has been disabled in my area. BSNL reported some kind of maintenance so IPv6 will only work for few days. But the thing is I am able to open only IPv6 supported sites in PC but any mobile devices other than my PC can't connect. All mobile devices shows connected to WiFi without internet, but there is internet, my PC and laptop remains connected to internet. Even IPv6 was allocated to both my PCs and mobile devices. WAN IPv6 mode is SLAAC, in LAN I had set it to RADVD since only that works, I tried enabling RDNSS but that also didn't work.

In mobile nothing opens not even google, but I get IPv6 ping & trace-route response from google.com, dns servers, microsoft.com etc unlike PC where all of them opens and internet is shown connected.

Also there is another issue, my ONU now disconnects automatically and then reconnects to internet at 10mins interval regularly. Even devices connected to it gets disconnected at the same time and then reconnects back.

On 19th Feb 2025, I noticed firmware as 1.10.... but today when I am writing this post I noticed firmware as 1.13 and that I copied. I am suspecting a firmware upgrade has rigged this ONU. At this moment, only IPv6 is enabled and I am posting this from PC and getting IPv6 internet, mobile still shows no internet.

Also the QoS feature is gone in the update and this automatic update rigged my ONU.