ESKY Tuning Tool Driver Installation Manual

Applicable models: ESKY fixed-wing flight controller series (Goose / Seagull / Sparrow / EYAS, etc.)

This manual was compiled based on the official video demonstration flow and the official website documentation — the steps match the video content.

1. Overview

The ESKY tuning tool (part no. ESKY008628) is the bridge between ESKY fixed-wing flight controllers and your computer. It uses a CP210x USB-to-UART (serial) chip, so your computer must have the Silicon Labs CP210x driver installed before the tuning software (host application) can communicate with the flight controller.

This manual guides you through downloading, installing, and verifying the driver on Windows 10 / 11. The whole process takes about 5–10 minutes.

1.1 Required Items

Item	Part No. / Spec	Notes
ESKY tuning tool	`ESKY008628`	Has a slide switch (USB / charge position) and a Micro-USB port
Micro-USB data cable	—	Must be a data cable, not a charge-only cable
Computer	Windows 10 or later	Internet access required for driver download

1.2 Driver Files

Version	File	When to Use
New version (first choice)	CP210x_Universal_Windows_Driver-2024.zip (latest official SL universal driver) Download: official esky-rc.com.cn link	Most Windows 10 / 11 computers
Old version (backup)	17214369317859.zip (contains an .exe installer) Download: official esky-sz.cn link	Older Windows 10 builds and some Windows 11 PCs, when the new driver fails

Both drivers are available on the ESKY official website under the "ESKY tuning software download and usage" page.

2. Driver Installation Steps (Main Video Workflow)

Step 1: Download and extract the driver

Open the official ESKY website (esky-rc.com.cn) and go to the "ESKY tuning software download and usage" page.
Download the new version driver CP210x_Universal_Windows_Driver-2024.zip.
Right-click the ZIP file → Extract All, and extract it to an easy-to-find location (e.g. D:\CP210x).
⚠️ Extract first, then install — do not operate from inside the ZIP preview window.

⚠️ Official reminder: when installing manually, point Windows to the root of the extracted folder — do NOT drill down into the x64 subfolder inside it!

Step 2: Connect the tuning tool to the aircraft

Connect the Micro-USB port on the top surface of the flight controller board to the ESKY tuning tool (ESKY008628); the tuning tool then connects via its USB cable.
Slide the switch on the tuning tool to the [USB] position (communication fails if it is in the charge position).
Use a Micro-USB data cable to connect the tuning tool to a USB port on your computer.

💡 For first-time driver installation, plug directly into a USB port on the computer and avoid USB extension cables or hubs.

Step 3: Open Device Manager and check the device status

Right-click the Start menu button → click Device Manager.
After plugging in the tuning tool, watch the device list. Without a driver, an "Unknown device / USB Serial Port" with a yellow warning icon usually appears under Other devices, or an abnormal entry shows up under "Universal Serial Bus controllers".
Remember this abnormal entry — it is the tuning tool without its driver.

Device status quick reference:

Device Manager shows	Meaning
Other devices → Unknown device (yellow icon)	Driver not installed — install manually in Step 4
Ports (COM & LPT) → Silicon Labs CP210x USB to UART Bridge (COMx)	✅ Driver installed, ready to use
No response at all	Check that the USB cable is a data cable, the switch is in the USB position, and try a different USB port

Step 4: Manually update the driver (key step)

In Device Manager, right-click the device with the warning icon → select Update driver.
In the pop-up window, choose Browse my computer for drivers.
Click Browse, navigate to the root folder of the driver extracted in Step 1 (e.g. D:\CP210x), keep "Include subfolders" checked, and click Next.
Windows searches and installs the driver automatically; click "Install / OK" if a security prompt appears.
Wait until "The driver has been successfully updated" appears.

⚠️ Again: select the extracted folder itself as the driver path — do not manually specify the x64 subfolder.

Step 5: Verify the installation

Return to Device Manager and expand Ports (COM & LPT).
If "Silicon Labs CP210x USB to UART Bridge (COMx)" appears (the COM number such as COM3 or COM5 varies by computer) with no yellow warning icon — the driver is installed successfully.
Right-click the device → Properties → General tab: "This device is working properly" confirms everything is fine.

💡 Unplug and re-plug the tuning tool once. If the COM port reappears reliably, the driver is fully ready. Note the COM port number — you may need it when connecting in the tuning software.

3. Backup Option: Old-Version Driver (.exe One-Click Install)

If the driver still does not work after Section 2 (mostly on older Windows 10 or some Windows 11 PCs):

Download the old-version driver ZIP (esky-sz.cn link, see table in 1.2).
Extract it and find the .exe installer in the folder.
Double-click to run it and follow the wizard through "Next / OK" to finish (right-click → "Run as administrator" if necessary).
After installation, unplug and re-plug the tuning tool, then verify the COM port as in Step 5.

4. Troubleshooting

Symptom	Solution
No response in Device Manager after plugging in	① Make sure you are using a data cable, not a charge-only cable; ② Check that the tuning tool switch is in the USB position; ③ Try a different USB port or another computer.
Device shows a yellow warning icon; manual update does not help	① Confirm the driver path pointed to the extracted root folder (not the x64 subfolder); ② Switch to the old-version .exe driver in Section 3.
Driver blocked / signature issue	Windows 11 enforces driver signing by default. Use the officially signed new driver from the ESKY website first; only consider temporarily disabling driver signature enforcement (Advanced startup → Startup Settings → Disable enforcement) as a last resort, at your own risk.
COM port appears, but the tuning software cannot connect	① Restart the tuning software (some apps scan serial ports only at startup); ② Close other programs occupying that COM port; ③ Confirm the flight controller is powered and properly connected to the tuning tool.
Conflict with a previously installed CP210x driver	In Device Manager, uninstall the device (check "Delete the driver software for this device") → restart the computer → reinstall as in Section 2.

5. After the Driver: Tuning Software Usage Notes

Download and install the ESKY fixed-wing flight controller host application (tuning software) FXZ.02.01.04 (Windows 10 or later, switchable between Chinese and English) from the official "ESKY tuning software download and usage" page.
Connect the aircraft to the computer via the tuning tool, then open the host application; if it prompts "software version mismatch / outdated", click "OK" → the [Upgrade] button in the top-right corner → keep clicking OK and wait for the automatic upgrade to finish.
⚠️ On first use, you must perform a transmitter (remote control) calibration in the calibration interface (official requirement).
Adjust servos and run tests in 3-axis (Hi) mode. In self-stabilizing (6-axis) mode the flight controller automatically corrects attitude, causing large servo movements — this is normal but misleading.
On the ground, after moving the sticks and releasing them, servos return to center "slowly" — this is normal.
Open-source transmitter users: create a new model, clear all mixes and throttle-cut settings, and set channels 8–20 to min/max travel = 0 (output only 1500); otherwise servo travel may be abnormal.