@SpeedxThunder is able to get 2.4Gb/s on his Airtel connection in Bangalore. Previously, he was not able to. OLT is same, ONU is same(2.5G ONU) but something was stopping him achieve these speeds, so my guess is his BNG was overcrowded and now since they upgraded the capacity(call it network card) of the BNG and now he is getting good speeds. Only limitation he faces now is GPON limitation of 2.4Gb/s.