Anytone At-5555n Ii Service Menu [portable] (Free ★)

This is not for the faint of heart. Changing these settings can void your warranty, brick your radio, or make it illegal to transmit. Proceed at your own risk.

Keep the buttons held until the LCD display changes to show the service menu interface (typically displaying a parameter code and a numerical value). Release the buttons. Navigation and Adjustments

To adjust a value, rotate the or MIC Gain knob (depending on the parameter). Save by powering off normally. anytone at-5555n ii service menu

The radio should now display "CH-01" or similar, indicating you are in the service mode. You can navigate settings using the

While the service menu covers many settings, some hardware adjustments still require physical access to the radio's circuit board. This includes components like VRs (variable resistors) for functions such as ASQ (Automatic Squelch) and SSB power. This level of adjustment is for advanced users only. This is not for the faint of heart

: Pushing final transistors past their rated limits will burn out the radio. How to Access the AnyTone AT-5555N II Service Menu

I’ve used the service menu on my AT-5555N II to gently bring my AM carrier down to 4W (for driving an amp) and to calibrate the frequency drift after warm-up. It’s a powerful tool, but treat it like surgery—make small changes, test, and always document your original settings. Keep the buttons held until the LCD display

The standard menu (accessed via the MENU key) offers a wealth of safe customizations that cover almost all user needs, including:

Use this to set the main frequency baseline. Adjust this first if the radio is significantly off.

: Do not proceed unless you are fully aware of the risks and have the necessary test equipment. The community is clear on this point: "DO NOT TRY AND CHANGE THE S METER SETTINGS WITHOUT A SIGNAL GENERATOR". Even with the correct key sequence, you are working with the radio's core calibration.