Step #18: Go to tab and confirm that the port is same with what you have on RealTerm in step #15. If it isn't then, change the what you have in RealTerm to match the other one.
Step #19: Now, go back to RealTerm >> Sent menu >> Paste "at+creg \r \n" in the message box a hit send.
Step #20: Replace that message with this: "atd123;\r\n" and hit send again.
Step #21: You will receive a call on your phone. Just press end and go to immediately you do that without navigating.
Step #22: Now you can disconnect your phone.
Step #23: Type "Google.com" in your phone's message box and press send. It will create .
Step #24: Press the hyperlink and it will take you to Google search engine.
Step #25: Type "Google Account Manager" in the Google search box, download from APKmirror. Make sure you choose the version (before August 2016) that will work on your phone.
Step #26: Go back to Google Search and download Quick Shortcut Maker from Pangu.
Step #27: Go back to Google Search >> search for Galaxy Apps >> Go to the Samsung first link that shows Samsung Galaxy Apps.
Step #28: From their page, scroll down and press "Samsung GALAXY Apps" button. Choose NO on the push notification.
Step #29: Click on the top search bar and type ES File Explorer. Download it.
Step #30: Sign in or Create a Samsung Account. It will sign in and load.
Step #31: Click/Press on Accept and Download.