To connect SM-G928F phone you have to perform the following steps:
1. Disconnect USB cable from phone.
2. Go to Menu->Settings->More->About Device.
3.Tap on "Build number" 7 times to enable developer options.
4. Go to Menu->Settings->More->Developer options.
5. Turn on "USB Debugging" option.
Platform: Samsung Android
Selected port: COM104
Selected model: SM-G928F
To put SM-G928F into Download Mode, You have to perform the
1. Reconnect the battery.
2. Press and hold "Volume-" + "Home" + "Power ON" keys.
3. When phone turns on, press "Volume+" key.
Searching for a phone. Please wait…
Resetting FRP lock..success
Resetting EE lock..success
Resetting Samsung Account lock..success
after showing success still frp is on