If *#0*# does not open the test menu, your security patch is likely too new for the "Emergency Call" exploit. You may need to wait for a newer tool update.
If you plan to sell or reset your phone, go to Settings > Accounts and Backup > Manage Accounts and remove the Google account manually first.
Use the app's "App Manager" to find "Service Mode" and enable "ADB" .
Known for a high success rate on Samsung devices.
If you haven't already performed a factory reset, be aware that these processes often involve wiping the device.
Navigate to the "Remove Google Lock (FRP)" section of the software.
For most users, using a dedicated desktop utility is the fastest and most successful route. These tools automate the complex "handshake" required to trick the system. Popular Tool Options: A comprehensive toolkit for Android.