: The screen should display " FM " (Factory Menu), indicating you have successfully entered the service mode. Essential Service Menu Settings
Ultimately, the service menu of the AnyTone AT-5555N II serves as a reminder of the sophisticated engineering behind 10-meter radios. While the ability to enter this mode offers a deeper look at the device's internal logic, the most responsible approach is to treat these settings with extreme caution. Maintaining a record of original factory values and prioritizing adherence to official technical documentation is essential for ensuring the longevity and legal operation of the equipment. anytone at-5555n ii service menu