Hi @Lily_sm, welcome to the community! Your question was translated to English with Google Translate (clickable link) , since this is a international forum.
No need to worry, the updates builds on each other, and you might have to do a few before your new phone is up to date. You can check so the version number changes after you done a update, just to be sure that the phone updates correctly. You do this under Settings (>System) > About Phone > Version. You can also use our update function at our website here (Clickable link) to see if your phone have any waiting updates.
You can as an alternative, connect the phone to a computer and do a software repair using Xperia Companion, which will remove all data in your phone and reinstall the latest available version. Just make sure that you done a backup using Xperia Companion before you start, so you don't lose anything important.
Keep me updated, and have a nice day!
