How to Unlock the Retevis HA1G: Step-by-Step Frequency Expansion Guide

Ozark GMRS | Radio Programming & Modification Guides

The Retevis Ailunce HA1G is a rugged, IP67-rated GMRS handheld radio. But did you know that certain firmware versions support an expanded frequency mode?

In this guide, we’ll walk through updating the HA1G firmware and accessing its frequency expansion feature.

Important: This modification does not turn the HA1G into an officially certified HA1UV. It changes available operating capabilities, not the radio’s original certification.

What You’ll Need

• Retevis Ailunce HA1G handheld radio
• Windows computer
• Compatible HA1G USB programming cable
• Retevis HA1G programming software (CPS)
• Official HA1G firmware
• Fully charged radio battery

Step 1: Back Up Your Radio

Before modifying anything, connect your HA1G to your computer.

1. Launch the Retevis programming software.
2. Select the correct COM port.
3. Read the existing configuration from your radio.
4. Save a backup copy of your channel programming.

This protects your repeater frequencies, tones, scan lists, and custom settings.

Step 2: Download the Latest HA1G Firmware

Visit the official Retevis firmware download page:

https://www.retevis.com/downloads/firmware

Find the HA1G firmware download.

Download the matching programming software if you don’t already have it.

Do not download HA1UV firmware for installation on an HA1G. Retevis specifically warns against cross-updating the two models.

Step 3: Update the HA1G Firmware

1. Turn off the radio.
2. Connect the USB programming cable.
3. Open the Retevis CPS software.
4. Select Operation → Firmware.
5. Choose the correct COM port and HA1G model.
6. Select the official HA1G firmware .bin file.
7. With the radio off, hold PTT + PF1 (SK1) while powering it on.
8. Confirm that the indicator illuminates red, indicating firmware update mode.
9. Start the firmware update using the software’s Download button.
10. Wait until the software reports successful completion before disconnecting anything.

Do not interrupt power or unplug the cable while firmware is being written.

Step 4: Access the Frequency Expansion Mode

Retevis HA1G documentation describes the following frequency-expansion shortcut on supported firmware versions:

1. Turn off your HA1G.
2. Press and hold PTT + 8 on the keypad.
3. While holding both buttons, power on the radio.
4. Check the display for the available operating-mode selection.
5. Select the appropriate mode according to your firmware’s instructions.

The exact selection screen and persistence of this setting can vary by firmware version. If your radio does not show the expected options, stop rather than guessing at additional key combinations.

Step 5: Verify the Radio

After restarting:

1. Open the radio’s information menu and record its firmware version.
2. Check whether additional VHF/UHF frequencies can be entered.
3. Verify that your original GMRS channels and repeater settings remain intact.
4. Test reception on a known active frequency.
5. Do not test transmission outside the frequencies and services for which the radio is legally authorized.

Step 6: Restore Your Programming

If your saved channels are missing or settings have changed:

1. Open the HA1G CPS software.
2. Read the radio’s current configuration first.
3. Check that your saved programming file is compatible with the updated firmware.
4. Restore the appropriate channels and settings.
5. Verify frequencies, tones, and transmit permissions before using the radio.

Important FCC Considerations

The HA1G is sold as a GMRS radio, while the HA1UV is sold as a VHF/UHF amateur radio.

Unlocking additional frequencies does not automatically authorize transmission on them.

An amateur radio license does not authorize transmission on public-safety channels, and it does not automatically make a modified amateur radio compliant with GMRS equipment requirements.

For everyday GMRS operation, retaining the factory-approved HA1G configuration is the safer choice.

Final Thoughts

The Retevis HA1G has some interesting capabilities for radio enthusiasts who enjoy exploring their equipment.

Firmware updates and frequency expansion can be useful, but owners should understand the technical risks and regulatory limitations before making changes.

For more GMRS programming tips, repeater information, and radio resources across Northwest Arkansas and the Ozarks, visit OzarkGMRS.com.

Ozark GMRS is an independent radio enthusiast community and is not affiliated with Retevis or Ailunce.