Problem Huawei y6 2018 does not connect to 4g


I don't know what else to do, it's either defective or it's from the software.
It does not want to connect to the 4g network. When I scan networks, it sees all the networks from all operators, but it only wants to connect to 2g or 3g, it shows me H+ instead of 4g. Not long ago I updated from to, should it be from there?
I specify that I have no experience with Android, I used a Nokia phone with buttons that lasted 7 days