If you have proof of purchase or can access your account, use these official methods first: Remove via iCloud.com : If you have the Apple ID and password, go to the Find My page on another device, select the locked iPhone, and click Remove This Device Apple Activation Lock Support Request
If you are the legitimate owner of the device, you don't need a third-party tool. Try these official methods first: 1. The "Forgot Password" Route open my icloud easy unlock tool