If your Holy Stone HS720 controller firmware update failed, the problem is usually more recoverable than it looks.
This guide explains the most common causes, the safest fixes, and how to restore stable communication between the remote controller and the drone.
Firmware updates on the HS720 can affect pairing, calibration, battery communication, and app connectivity, so a failed update may create several symptoms at once.
The good news is that most update failures come from a short list of issues you can diagnose systematically.
What the HS720 controller firmware update is supposed to do
The Holy Stone HS720 remote controller uses firmware to manage signal handling, button input, flight mode commands, and communication with the aircraft.
When an update succeeds, it can improve compatibility, reduce connection errors, and support app-driven features through the Holy Stone app or related flight software.
Firmware is not the same as a normal app update.
It rewrites low-level device instructions, which means interruption during the process can leave the controller temporarily unresponsive or mismatched with the drone.
Why a Holy Stone HS720 controller firmware update failed
A failed firmware update usually happens because the update process was interrupted, the controller was not fully charged, or the app lost its connection before the flash completed.
In other cases, the issue is caused by an incompatible firmware package or an unstable phone-to-controller link.
Common causes
- Low controller battery: The update can stop if power drops too far during installation.
- Unstable phone connection: Bluetooth, Wi-Fi, or USB communication may break mid-update.
- Incorrect firmware file or version: The controller may reject a package intended for a different HS720 variant.
- App interference: Background apps, permission blocks, or OS restrictions can interrupt the process.
- Weak internet during download: Some updates fail before installation because the package never downloads correctly.
- Drone-controller mismatch: After one device updates and the other does not, pairing can become inconsistent.
Signs the update did not complete correctly
When the Holy Stone HS720 controller firmware update failed, you may notice immediate or delayed symptoms.
Some are obvious, while others appear only when you try to fly.
- The controller will not power on normally.
- Indicator lights flash in an unusual pattern.
- The app shows “update failed,” “device disconnected,” or a similar warning.
- The controller pairs poorly or not at all with the HS720 drone.
- Flight commands lag, stick input is inconsistent, or the drone does not respond.
- The app recognizes the drone but not the controller, or the reverse.
What to do first after a failed firmware update
Start with the least invasive recovery steps.
In most cases, the controller is not permanently damaged, and a clean restart resolves the issue.
- Power everything off: Turn off the drone, controller, and phone or tablet.
- Charge the controller fully: Use the original or a reliable USB cable and allow enough time for a full charge.
- Restart the mobile device: Clear temporary app or OS issues before attempting another update.
- Close all background apps: Free memory and prevent connection conflicts.
- Move to a quiet RF environment: Avoid crowded Wi-Fi areas when retrying the update or pairing process.
How to retry the update safely
If the first attempt failed, the next step is to retry under controlled conditions.
A clean retry often succeeds because the previous failure was caused by a temporary connection break rather than corrupted hardware.
Use a stable setup
- Charge the controller to 100 percent before starting.
- Keep the phone battery above 50 percent or connected to power.
- Use the exact app recommended by Holy Stone for the HS720.
- Allow the app all required permissions, including Bluetooth, location, and local network access if requested.
- Do not disconnect the controller or drone until the app confirms completion.
Check whether the update is actually for the controller
Some HS720 update packages are meant for the aircraft, remote controller, or camera system separately.
If you install the wrong package, the app may fail the process or create a mismatch between devices.
Verify the model number and firmware notes before trying again.
How to restore pairing after a failed update
Pairing problems are common after a firmware interruption because the controller and drone may no longer speak the same firmware language.
Rebinding the devices often restores normal operation.
- Turn off the drone and controller.
- Place the drone on a flat surface with propellers clear of obstacles.
- Follow the Holy Stone HS720 pairing sequence in the manual or app.
- If available, use the app’s reconnect or calibration function after pairing.
- Test stick input slowly before attempting takeoff.
If pairing still fails, reset both devices according to the manufacturer’s instructions and try a fresh binding session.
Avoid repeatedly powering the drone on and off in rapid cycles, since that can create confusion in the connection process.
When controller calibration matters
After a failed firmware update, some pilots mistake calibration issues for update failure.
In reality, the controller may be functional but misaligned.
Calibration can help if the sticks behave erratically, the drone drifts, or the app reports abnormal input.
Use calibration only after the controller powers on normally and pairs successfully.
If the controller is still stuck in an update error state, prioritize firmware recovery before calibration.
Preventing another firmware failure
Once the Holy Stone HS720 controller firmware update failed, the next goal is preventing repeat problems.
Most repeat failures come from the same setup mistakes.
- Update only with a fully charged controller and aircraft battery.
- Use one phone and one cable during the entire update process.
- Disable aggressive battery saver modes on the mobile device.
- Keep the controller near the phone or tablet during installation.
- Do not answer calls, switch apps, or lock the screen if the app warns against it.
- Confirm the update source is the official Holy Stone app or support-provided package.
How to tell if the controller is damaged
Most failed updates are software issues, not hardware failure.
Still, there are signs that suggest deeper damage to the controller or its internal memory.
- The controller never powers on even after full charging.
- LED indicators stay frozen or completely dark.
- No device is detected by the app after multiple clean retries.
- The controller becomes unusually hot during the update attempt.
- The same error appears on different phones and cables.
If several of these symptoms persist, contact Holy Stone support with your model number, firmware version, and a description of the failure point.
Clear documentation speeds up troubleshooting and helps determine whether the controller needs replacement or advanced recovery.
What information to gather before contacting support
Support teams can usually help faster when you provide specific details about the Holy Stone HS720 controller firmware update failed error.
Prepare the following information before opening a ticket or chat.
- Exact HS720 model and controller variant
- App name and version
- Phone or tablet model and operating system
- Firmware version before the update, if known
- Battery levels at the time of failure
- Exact error message or LED pattern
- Whether the drone still pairs after the failed update
Clear records make it easier to distinguish between a temporary update interruption and a more serious controller issue.
They also help support confirm whether the controller needs a recovery package, a different firmware file, or a warranty review.