I have Mi Max 2, it has never troubled me with any ads, except the one on app lock screen which never appear once I close it that too once in a month.
@RajKumar - brother i have some questions for u,
1. Is Redmi 6A only sold on amzn or mi.com too?
2. Since it's a flash sale do they accept COD or we have to make instant online payment?
3. How many ads have u experienced?
4. What are the alternatives to Redmi 6A?