I finally updated to OneUI 4.1 using smart switch. When the phone started updating, on the screen korean words were displayed along with English words..
Have you also noticed this when you updated through smart switch?
The first update size was almost 6.5gb. Surprisingly, it got updated to 4.0 only. After that update, it was showing 6774mb for further updates. But then I updated the rest through settings app.
