Hi TP-Link Community,

I’m using a TP-Link XC220-G3v V2 (Aginet GPON/ONT router) on a BSNL FTTH connection in Tamil Nadu, India.
The router was working earlier, but internet stopped suddenly a few days ago. The local operator is saying it could be a “firmware issue” and suggested changing firmware. They also mentioned that they officially support only certain ONTs (Xyrotech / Netlink / Huawei) for troubleshooting.

Before making any changes, I would like some technical clarity.

My questions

1. Are there any known firmware compatibility issues with XC220-G3v V2 on BSNL FTTH (especially in Tamil Nadu) that can cause sudden internet loss?

2. If the router’s GPON state is not reaching O5 (Registered), does that usually indicate:

   • a firmware problem on XC220-G3v, or

   • a BSNL provisioning / ONT authorization issue (serial / LOID / OLT profile)?

3. Has anyone experienced BSNL or local operators stopping third-party ONTs after OLT upgrades or backend changes, even if they worked earlier?

4. If this is not a firmware issue, would purchasing and using a TP-Link XX530v (instead of XC220-G3v) realistically solve the problem — or would it face the same BSNL authorization limitations?
   (I have not tried XX530v on this BSNL line yet.)

Goal

To understand whether this is:

• a real XC220-G3v firmware issue, or

• a BSNL / LCO provisioning or policy issue,
  and whether buying XX530v would genuinely help or not.

Country: India (Tamil Nadu)
Model: XC220-G3v V2

Thanks in advance for any guidance.