1st Method
www.iCloud.com website.
- Log into www.icloud.com with your Apple ID and Password
- Select this device from All Devices drop down and select your device
- Device pop up box will appear.
- Click Remove from Account
- Confirm by clicking Remove
2nd Method
From another Apple device with same Apple ID
- Tap Settings > [your name], then scroll down.
- Tap any device name to view that device’s information
- Scroll down and Tap [ Remove from Account ]
Here is the way to turn off Reactivation Lock from Google’s website.
- Log into https://myaccount.google.com with your Google email address and password.
- “Under Sign In & Security >” On left of screen – click on “Device Activity And Notifications”.
- On the right of the screen click “Recent security events” and click on “REVIEW DEVICES”
- You will now see all devices linked to your Google account.
- Click on every single device which you want to remove (inc. the one mentioned above) and select REMOVE under account access.