I think A20 can also do Dex mode with PC like the S series devices right? Can you try to plug the phone to your computer and use the dex mode to report through Samsung Members app? Or... if you had your phone connected to your Windows (if you use windows) then Your Phone app that comes with the Windows should also let you control the phone on your computer. Hope this helps. In the case that neither works... You could 1. chat with Samsung's service member by contacting them through website and see if you could send in your phone or if they could set up a service for you... 2. take it to UBreakIFix if there is one near you, and ask them to help pull the logs (phone issue data) to report the issue.
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