Click "Firmware Upgrade" when printer prompts upgrade prompts printer performance. At this point, the mobile device will check whether the firmware of the printer is the latest firmware program. If it is the latest firmware program, it will be prompted to "use the latest firmware program".

3. If it is not the latest firmware program, new firmware programs will be prompted to upgrade, whether to upgrade.

4. After clicking the "Upgrade" button, it will be displayed on your mobile device in turn: downloading; transmission; transmission completed.

5. Printer screen display at this time: Do not close the printer, please wait for the firmware upgrade of the printer to complete.

If the printer is suddenly powered off during the upgrade process and cannot start, it will not be able to start the display firmware mode, which requires firmware brush back. Turn on normally again