Is your printer getting stuck during printing with "Working" displayed on the screen?
Follow the steps below.
1, - Make sure you have activated Bluetooth and enabled Location Services for the Tendy app.
2, - Open the app and go to Devices. Then tap the settings icon in the upper right corner.
3, - Tap the text TROUBLESHOOTING 7 times, and a new menu will appear.
4, - Under the Print rate option, select "With response"
5, - After that, scroll up and select "Test Printer"
Here is a screen recording showing how it's done.