Download Printer Mobile App for P831 

1. Make sure all permissions are allowed when installing the app. You can open them in your phone's Settings.
2. If you can't find your portable printer model on the Bluetooth connection page, please turn on the printer, double-click the power button to print out the QR code, and then scan the code to connect in the app.

1. Make sure that the power socket is charged, and the charging cable and the charging head with an output voltage of 5V-2A can work normally.Use other electrical devices to see if the power socket, the charging cable and charging head can work normally.
2. Reconfirm that the output voltage of the charging head in use is 5V-2A. Fast chargers with output voltage exceeding 5V may damage the printer.
3. If the printer still can't charge, try to replace another 5V-2A charging cable and charging head. After charging for half an hour, check if it can be turned on.
4. While charging, try to poke the small hole next to the charging port with a paper clip or a similar tool. Restart the printer after charging for half an hour to see if it works properly.

1. Make sure you are using thermal paper.
2. Make sure the front and back of the thermal paper are not misplaced. (For non-adhesive paper, the side with a black line after scratching with your fingernail should face down.)
3. Double-click the power button to print the QR code.
4. If the print head is jammed, try to press hard to see if it springs back.Here's the TUTORIAL that may help you.

1. Insufficient battery power can affect printing quality. Please check the battery level of the printer. If it is below 30%, please charge it for 2-3 hours before printing.Turn on the printer and double-click the power button to print the self-test page to check the printer’s battery level.
2. Adjust the print density in the app.Click on “Print” and adjust the print density in the print preview.
3. Clean the print head.Use alcohol wipes to clean the cutting section of the printer, especially where there are black lines, to make sure there is no adhesive residue or foreign objects on the print head.
4. The quality of image printing depends on the original image. If your original image is not clear enough, please try printing different images and then check the printing quality.

Please follow the instructions below:
1. First, open the printer without inserting any paper.
2. Next, press and hold the power button for 10-20 seconds until the indicator light flashes twice, then release the power button to finish the process.
3. Finally, long press the power button to turn on the printer and then reload the paper to print.
Video about how to place the tattoo paper properly. 

Please download the latest driver from the official website.
Please download the appropriate driver according to your operating system version and follow the instructions video to install the driver: Download for Phomemo Portable Printer

Make sure the printer is turned on and remains on before connecting to the computer.Please connect the printer directly to the computer without using a converter.If the problem persists, please try the following steps.
1. Try to unplug and re-plug the USB cable.
2. If your computer has two USB ports, try to switch the other port.
3. Try to connect using a different USB cable.

On the website below shows how to place the tattoo paper properly.
https://www.youtube.com/watch?v=DqNUfSoYN2M

Regardless of the operating system, first check if the printer is turned on and is connected correctly.

Make sure the printer is turned on and remains on before connecting to the computer.
Please connect the printer directly to the computer without using a converter.If the problem persists, please try the following steps.
1. Try to unplug and re-plug the USB cable.
2. If your computer has two USB ports, try to switch the other port.
3. Try to connect using a different USB cable.

1. Make sure the tattoo paper is installed correctly. Pull the tattoo paper to the correct position and close the printer top cover.The website HERE shows how to place the tattoo paper properly. 
2. If the tattoo paper is installed correctly, double-click the power button to print out the QR code and check if the printer can work normally.
3. Make sure the printer has sufficient battery power. If it falls below 20%, charge it for about 2 hours before starting it again.
4. Use thermal paper instead of tattoo paper for printing and check if the printer works normally.
  If the above steps do not solve the problem, please provide us with the printer’s serial number (SN) and firmware version. It can be solved by upgrading the firmware to V1.2.1.

Regular black lines or black blocks indicates that the print head is damaged. Please replace the printer.
1. Try to clean the print head. Use alcohol wipes to clean the cutting section of the printer, especially where the black lines are, to make sure there is no dirt.
2. Try to double-click the power button to print the QR code.