1. Introduction
The RadioMaster Zorro Controller is a compact and versatile 2.4GHz 16-channel radio transmitter designed for remote control applications, including drones and other RC gear. It features Hall sensor gimbals for precise control and supports both OpenTX and EdgeTX firmware, offering extensive customization options. This manual provides essential information for setting up, operating, maintaining, and troubleshooting your Zorro Controller.
2. Key Features
- Ergonomic Design: Comfortable gamepad-style form factor for extended use.
- Large LCD Screen: Bright 128x64 monochrome LCD display positioned for optimal viewing.
- Hall Sensor Gimbals: Travel-adjustable gimbals provide smooth and precise control.
- Firmware Support: Officially supports OpenTX and EdgeTX firmware for advanced customization.
- External Module Bay: Nano size bay compatible with modules like TBS Crossfire, Nano Tracer, and ELRS.
- USB-C Connectivity: Built-in USB-C port for charging, data transfer, firmware updates, and simulator use.
- External Power Input: Supports external 2S battery power supply for extended operation.
- Assignable Controls: Rear and top assignable push buttons and scroll wheels for flexible control.
- Menu Navigation: RadioMaster's 7-button menu navigation system for intuitive setup.
- Audio Output: Headphone audio output for alerts and telemetry.
3. Setup
3.1 Unboxing and Initial Inspection
Carefully remove the Zorro Controller from its packaging. Inspect the unit for any signs of damage. Ensure all included accessories, such as the battery cells, are present.

Figure 1: Front view of the RadioMaster Zorro Controller, showcasing its ergonomic design and central LCD screen.
3.2 Battery Installation
The Zorro Controller uses 2 Lithium Ion 18350 batteries (included). To install:
- Locate the battery compartment on the rear of the controller.
- Open the battery compartment cover.
- Insert the two 18350 Lithium Ion batteries, ensuring correct polarity as indicated inside the compartment.
- Close the battery compartment cover securely.

Figure 2: Rear view of the RadioMaster Zorro Controller, showing the battery compartment and external module bay.
3.3 Charging
The Zorro Controller features built-in USB-C charging. Connect a USB-C cable to the port on the top of the controller and to a suitable USB power source. The charging indicator will show the charging status. The controller also supports an external 2S power supply for charging or extended use.
3.4 Firmware Update
Firmware updates can be performed via USB or using an SD card (not included). Refer to the official OpenTX or EdgeTX documentation for detailed instructions on updating the firmware to ensure optimal performance and access to the latest features.
3.5 Binding to Receiver
The binding process depends on the specific receiver and internal RF option (e.g., ELRS). Consult your receiver's manual and the Zorro Controller's firmware documentation for detailed binding procedures. Generally, this involves putting both the transmitter and receiver into bind mode.
4. Operating Instructions
4.1 Basic Controls
The Zorro Controller features two Hall-effect gimbals for primary control inputs (throttle, aileron, elevator, rudder). Various switches, buttons, and scroll wheels are available for auxiliary functions and menu navigation.

Figure 3: Detailed front view of the RadioMaster Zorro Controller, highlighting gimbals, buttons, and LCD screen.
4.2 Menu Navigation
Utilize the 7-button menu navigation system (SYS, RTN, PAGE>, PAGE<, TELE, and scroll wheels) to access and configure settings within the OpenTX/EdgeTX firmware. The LCD screen displays menu options and telemetry data.
4.3 Model Setup
The OpenTX/EdgeTX operating system allows for extensive model setup. This includes:
- Creating new models and selecting model types.
- Configuring channels, mixes, and curves.
- Setting up flight modes and special functions.
- Adjusting gimbal travel and calibration.
Detailed instructions for model setup are available in the comprehensive OpenTX/EdgeTX user manuals, which can be found online.
4.4 Simulator Use
Connect the Zorro Controller to your computer via the USB-C data port to use it with flight simulators. This allows for practice and skill development without risking your physical models. Ensure your simulator software is compatible with OpenTX/EdgeTX controllers.
5. Maintenance
- Cleaning: Use a soft, dry cloth to clean the controller's exterior. Avoid harsh chemicals or abrasive materials.
- Storage: Store the controller in a cool, dry place away from direct sunlight and extreme temperatures. Remove batteries if storing for extended periods.
- Gimbal Care: The Hall sensor gimbals are designed for durability. Avoid applying excessive force or exposing them to dust and debris.
- Firmware Updates: Regularly check for and install the latest firmware updates to benefit from improvements and bug fixes.
6. Troubleshooting
| Issue | Possible Cause | Solution |
|---|---|---|
| Controller does not power on | Low or uncharged batteries; incorrect battery installation. | Ensure batteries are fully charged and correctly installed. Try charging the controller. |
| No response from model | Not bound to receiver; incorrect model setup; out of range. | Verify binding, check model settings, ensure model is within control range. |
| Gimbals feel stiff or imprecise | Dust/debris in gimbals; need for calibration. | Clean around gimbals. Perform gimbal calibration through the firmware settings. |
| USB-C charging not working | Faulty cable/charger; port issue. | Try a different USB-C cable and charger. Ensure the port is clean and undamaged. |
7. Technical Specifications
| Feature | Specification |
|---|---|
| Model Name | Zorro |
| Dimensions | 170 x 159 x 108 mm (6.69 x 6.26 x 4.25 inches) |
| Weight | 350 grams (1.44 pounds) |
| Control Channels | Maximum 16 (Rx dependent) |
| Operating Frequency | 2.400GHz-2.480GHz |
| Internal RF Options | ELRS (variant specific) / 4-in-1 Multi-Protocol (other variants) |
| Supported Protocols | Module Dependent |
| Operating System | OpenTX / EdgeTX Compatible |
| Gimbal Type | Hall-effect |
| Display | 128*64 Monochrome LCD |
| Charging | Built-in USB-C Charging |
| Operational Voltage | 6.6-8.4V DC |
| Operational Current | 160mA@8.4V |
| Control Distance | > 2km @ 20dBm |
| RF Power | 4-in-1 20dBm max |
| Batteries | 2 Lithium Ion 18350 batteries (included) |
| Compatible Devices | Windows (for simulator use) |
8. Warranty and Support
For warranty information and technical support, please refer to the official RadioMaster website or contact your authorized dealer. Keep your proof of purchase for warranty claims. Online resources, forums, and community support are also available for OpenTX/EdgeTX users.





