Hello aspirant

hope you are doing great. As per your query  I would glad to tell you that if you upgrade the seat then it means if you havent alloted the seat in next round ,you will have your seat in alloted college and if you got the seat then only you previous seat will be alloted to someone else . So dont worry you still have your seat which you have been alloted in the first round

Hope you found this answer helpful. Good luck for your future