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Forgotten unlocking scheme
Forgot the unlock pattern my phone xperia xz3
Schéma de déverrouillage oublié
Oublié le schéma de déverrouillage mon téléphone xperia xz3
I've edited your post as this is an English only forum, you can use Google Translate to reply and/or post.
Take a look at this guide
/t5/FAQ/How-to-unlock-a-phone-w-o-reseting-reformating-the-phone/td-p/927295
Hi @Gocha2803, I am sorry to hear about this.
The service that @uliwooly is referring to has been discontinued and is no longer available. There is no way to change a lock pattern that is already set. There is however two ways to get access to your phone again. Please note though that both ways will erase all personal data from the phone such as photos, contacts, messages etc.
The first option is to perform a software repair in the phone using a computer and our program Xperia Companion, for more information on how to perform a software repair click here. The second option is to use a service called Find My Device. Just log on using your Google-account, find and click on your phone and click the option called Erase.
Try one of these measures and let me know how it goes!