My Iphone 11 was activated by an old owner
Hi, my name is Ly. 3 months ago, I've bought an old Iphone 11 from a website in Canada. Everything actives normal until now, my phone has automatically set up unlock password that I don't know. Then I had tried to access but it is not successful, so that I had restored this via Itunes but after that it still appears "This phone is activated by an owner", hence I cannot access to my phone anymore. Please let's help me to solve this. I'm Vietnamese, may what I explain is difficult to understand, so please forgive me.
iPhone 11