1. Please make sure Bluetooth is turned on in the "Quick Switch" or "Control Center" page of your phone, and then connect the printer in the "Main Printer" application.
2. Please make sure that you have obtained all permissions when downloading and installing the application, if not, please enable it in the "Settings" of the phone system.
3. If none of the above methods work, use a thimble or similar tool to poke the reset hole next to the power port and try to restart the printer and phone.

1. Confirm whether the paper roll is thermal paper: Thermal paper can only be printed on one side. Use your fingernail or any other sharp object to scrape the paper. If any color appears on the paper, it is thermal paper. Install this side facing the print head.
2. Clean the print head using an alcohol cotton pad. Make sure there is no dirt or adhesive residue on the print head. Allow the print head to air dry and then try printing again.

1. Make sure the paper roll is installed correctly by checking that it is installed on the right side of the printer (required for M110, M120 only) and pulling the paper roll to the paper outlet.
2. Try cleaning the printer sensor with an alcohol-based cotton pad.
3. If it still doesn't work, follow the steps below: First, remove the paper roll inside the printer then turn the printer on.Second, close the printer cover, press the power button to select the firmware version, and then press the paper feed button to confirm.Third, reinstall the paper roll for printing.
4. Please connect the printer to the Printer Master, when the App prompts the label paper abnormalities, please click [not yet resolved], and then according to the prompts to remove the label and close the printer cover, click the bottom of the App under the boot state [reset], wait for 5 seconds, restart the printer, and then reinstall the label to see if the printer is normal recognition of labels.

1. When the print is not clear, increase the print consistency through Printer Master before printing and then try printing again.
2. Try wiping the printer print head, especially the black line, with alcohol pads to make sure the print head is free of dirt.
3. If the anomaly still occurs, try printing on a different roll of paper, as it may be affected by moisture and affect print quality.
4. Please check the power supply of the printer. If the power is less than 30%, please charge the printer for 3 hours and then print the label to check the printing effect.
5. Please note that poor image quality also affects print quality. For example, an image with a white background color will print with a lot of spots or lines when the image quality is low.