. This hidden menu allows for hardware-level alignment and frequency calibration that is not available in the standard user background menu. Accessing the Service Menu Before attempting these steps, write down your current settings
Not every service menu story has a happy ending. One operator famously shared their experience of buying a secondhand AT-5555N II at a . The radio appeared normal, even displaying the previous owner's custom call sign on the LCD. However, upon powering it up, the S-meter was permanently pegged, and the radio emitted nothing but static. anytone at5555n ii service menu updated
Recent user findings and firmware updates identify several specific parameters used for fine-tuning performance [6, 10]: Setting Adjustment Tips BFO Frequency One operator famously shared their experience of buying
: All LCD segments will illuminate for approximately 2 seconds. Within this window, release the buttons and immediately press the top-row keys in this specific order: [RB] , [NB] , [SCAN] , [MEM] , then [EMG] . Recent user findings and firmware updates identify several