It might help you please follow the instructions-
1. To start with first you need to hard reset your device using the button combination "Power + Volume UP + Menu".
2. Now you need to download the Samsung bypass tool and extract it to your PC.
3. Once extracted copy the "Bypass any Samsung Google Account Lock.apk" file to a USB Pendrive with OTG feature (or you can use an OTG cable with a normal Pendrive).
4. When you connect the OTG USB storage file manager will appear on your Galaxy Phone.
5. Now tap on the .apk file to install it. If the installation is blocked then go to "Setting->Security and give a checkmark to "Unknown sources", once done install the .apk file.
6. In the next step please open the app and you will get your Galaxy Smartphone's "Settings" menu.
7. Now tap on Back up & Reset-> Factory data reset ->Reset device -> Delete All. Your phone will restart and once done the FRP lock will be removed from your phone. You will no longer be asked for any Gmail account during the setup.
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