1. Check whether the Bluetooth function of the mobile phone is turned on; 2. Restart the machine or APP and search again; 3. Turn off the Bluetooth of the mobile phone and turn it on again.

According to Android phone system requirements, the PIN code is mostly 0000 by default, but in special cases it may be 1234 or 16 zeros.

Due to limitations of the Android phone system, location services must be enabled to use the Bluetooth function.

1. Check that the label paper is placed correctly, ensuring it protrudes 0.5 cm from the machine; 2. Check if the label paper or ribbon is depleted. Replace it promptly if necessary.

Follow the steps outlined in the app's error message to resolve the issue.

1. Restart your device or the app and try searching again; 2. Turn your phone's Bluetooth off and on again.

1. Confirm that you are using genuine NIIMBOT label paper; 2. You can press the power button once to feed one sheet of paper and then print again; 3. Double-click the power button to print a self-test page, take a photo of the self-test page and send it to customer service for feedback and resolution.

1. Check if the label paper size matches the APP template; 2. The print offset can be adjusted using the APP's editing function.

1. Check if there are labels or foreign objects stuck to the paper tray sensor. 2. Check if the template size set in the app matches the actual size of the label. 3. Check if the paper type set in the template is incorrect. 4. If the above issues are ruled out, the problem is a detector malfunction. Please contact customer service for assistance.