2021 Dacia Sandero my car wont start

Sounds like battery completely flat and needing checked . If o.k , needs charged . For different reasons , jump starting doesn't often work with some people / cars

I tried to put another battery but still the same problem

Should still be under warranty , contact your dealership who service the car for checking / fixing

Ok,thx

As one person said , it should be under warranty, so your best bet is to ask your car dealer to fix it. I had the same problem with a 2001 Ford Focus and the mechanic explained to me that in newer cars it's more complicated than just replacing a dead battery with a new one, as the car computer will reset when disconnecting/reconnecting to the battery. That's the reason it wouldn't start. Since the car is almost new, is better to take it to your car dealer in order to avoid losing the warranty.

A " 2001 Ford Focus " is completely different from the vehicle in the post and should start after battery change . Your suggestion in taking to dealership has already been posted