Firstly, find the user manual of the fuel cell breath alcohol tester and determine the specific operation method of restoring the factory settings. The method of restoring the factory settings of each breath alcohol tester may be different. It is recommended to read the user manual carefully to understand the detailed operation steps.
Turn off the power of the fuel cell breath alcohol tester.
According to the prompts in the user manual, use the corresponding buttons or operation steps to enter the interface of restoring factory settings.
According to the prompts in the user manual, use the corresponding buttons or operation steps to start the process of restoring the factory settings. This process may take some time, so it is recommended to wait patiently.
After the factory settings are restored, turn on the power of the fuel cell breath alcohol tester again, and make corresponding settings according to the prompts in the user manual.
Note: Restoring the factory settings will clear all settings and data of the fuel cell breath alcohol tester, so it is recommended to do so.