M1591664293492 , via OnePlus 8 , Sep 28, 2020 : There is an issue with my one plus 8. I flashed my phone with OBT 1 update by one plus. I didn't like the update as it was draining too much battery. So I downgraded from there to stable versions. But now issue is that currently I am using oxygen os 10.5.11 . And according to me 10.5.13is already out for indian users. But I am not able to get that update via OTA.Please help.