Thanks for the suggestion. But I have already asked the support center and they are saying that there is no upgradation available and I should return the router back from where I bought it.

I have TP Link XC220 G3v AC1200 with Firmware Version:1.2.0 0.8.0 v6062.0 Build 220527 Rel.36860n. It supports only GPON Now I have seen A video of the same product which supports XPON with Firmware...