5.Any questions ? Contact us first via Amazon . One-on-one guidance is available ,so that you can fully benefit from the product without unnecessary returns. We're here to ensure a smooth and accurate testing experience—feel free to reach out anytime!
6.Different incorrect operations can cause different error codes to appear on the screen, and you can find solutions in the user manual. For example, for the code of E-3, as long as it is a newly purchased-item, there is no need to worry about the expiration-date. All accessories are brand-new, and you need to set the correct date and time for the machine, otherwise the system will recognize the chip according to the wrong date, resulting in E-3 .