Dear Aspirant,

Hope you are doing well

No,you can't change your nationality in round 2 from Indian to NRI for NEET counselling 2021 if you opted Indian in round 1.As when you select your category as Indian then after that in all further round counselling you are only eligible for the Indian nationality counselling procedure,as there is also no such law made for this during mid in counselling procedure.

You should visit the link mentioned below to check more information regarding counselling and latest news of counselling :

https://medicine.careers360.com/articles/neet-counselling

Hope above information helps to resolve your doubts regarding this.

Have a good day and great future ahead.