What does "not working" mean?
Can you give some more details?
1) Config File:
-Download the config file to your Android's download folder.
-Download Total Commander on your Android from the app store.
-Open Total Commander
-Browse the "Downloads" directory
-Find the 3cxconfig file
-Click it
-Select *Open With
-Select *Open With 3CX
2) QR:
-Go to Management Console > Extensions
-Create an extension. Make sure you put a valid e-mail when you create it.
-Once created, click on the extension in the extension list and press the "Send Welcome Email" button on the top.
-Open your E-mail.
-Go to your PBX's WebClient page: yourcompany.3cx.eu:5001/webclient
-Type username and password found in e-mail
-Login
-Go top right
-Click on your Avatar/User Image icon
-Click on QR Scan
-Scan it with your 3CX Android App's QR scan feature under the "More" tab.
What doesn't work about the above?