I did a factory reset after the update and still now I didn't face any issue

Are you sure? I am also not getting one ui 6 in my A73,so I was also thinking about changing csc. After reading your comments I decided not to change ta cscBut are you sure update would come between 23 to 28 Dec? Everybody got December update in Indi...

It is because Samsung and apple keeps ta SAR value as low as possible

And I am stuck with the august security patch with one ui 5.1 in my A73

My A73 is bought from Singapore and I'm using it in BangladeshI didn’t also get the update. Let's just wait,there is no problem but the update will take time to come in our device