When you enable training mode, the terminal is unable to process any transactions. To resume transaction processing, you need to disable training mode.
From the main screen, touch the Menu button.
Enter the merchant password and touch Confirm.
Scroll to the Help & training tools section.
Touch Training mode.
Toggle the Enable training mode switch to the left.
If you have more than one terminal, repeat steps 1 to 5 for each additional terminal where you want to disable training mode.