What a Failed HS175 Controller Firmware Update Means
A Holy Stone HS175 controller firmware update failed when the remote control cannot complete the firmware writing process or loses communication with the drone or app during the update.
This guide explains the most common causes, how to recover the controller, and how to reduce the chance of damaging the update process again.
The HS175 relies on stable power, a consistent connection, and the correct firmware package.
When any of those parts break down, the update may stop halfway, freeze, or appear to succeed without actually applying the new version.
Common Reasons the Update Fails
Firmware updates on consumer drones usually fail for a small set of reasons.
The Holy Stone HS175 controller is no exception.
- Low battery on the controller or drone during the update
- Unstable USB connection between the controller and phone, computer, or charging cable
- Interrupted Wi-Fi or Bluetooth pairing if the update depends on the app
- Incorrect firmware file downloaded for the wrong component or revision
- App crash or background interruption on iOS or Android
- Corrupted firmware package caused by a bad download
- Outdated Holy Stone app that cannot communicate properly with the controller
In many cases, the problem is not hardware failure.
It is usually a communication or compatibility issue that can be fixed with a careful retry.
First Checks Before Retrying
Before repeating the update, confirm the basics.
These simple checks solve many update failures without needing replacement parts or service.
Verify power levels
Charge the controller fully and make sure the drone battery is also well charged if the update involves both devices.
Firmware updates should never be started with a nearly empty battery.
Confirm the correct app version
Use the latest Holy Stone app version available from the App Store or Google Play.
Older versions may not support current firmware files or device handshakes.
Use a stable cable and port
If the update is performed through USB, replace any loose or damaged cable.
Some inexpensive cables can carry power but fail to transmit data reliably, which causes the process to stop unexpectedly.
Close background apps
Mobile devices can interrupt the firmware process when other apps take focus, especially if battery optimization or permission settings restrict the Holy Stone app.
How to Recover After the Update Fails
If the Holy Stone HS175 controller firmware update failed, the goal is to restore communication and attempt a clean reinstall.
Follow these steps in order.
- Power off the controller and drone completely. Wait at least 30 seconds before turning them back on.
- Restart the phone or tablet. A fresh reboot clears app and Bluetooth caching issues.
- Uninstall and reinstall the Holy Stone app if the update was managed through the app.
- Forget and re-pair the controller or drone in Bluetooth or Wi-Fi settings, then reconnect from scratch.
- Reconnect using a known-good cable if the firmware transfer happens through USB.
- Download the firmware again from the official Holy Stone source to avoid a corrupted file.
- Run the update in one uninterrupted session with no calls, notifications, or app switching.
If the controller shows signs of partial updating, such as missing functions or unresponsive buttons, repeat the firmware procedure only with the correct file and only after the device has fully restarted.
Signs the Controller May Need a Different Recovery Approach
Not every failed update looks the same.
Some failures are obvious, while others are subtle and easy to overlook.
- The controller powers on but will not connect to the drone
- Indicator lights flash in an unusual pattern
- Buttons respond inconsistently after the update
- The app reports success, but the version number does not change
- The controller freezes during startup
These symptoms can indicate that the firmware write was incomplete.
If the controller still operates normally, you may only need to rerun the update.
If startup behavior changed, recovery may require a full re-pairing sequence or support from Holy Stone.
Best Practices for a Successful Retry
A careful retry is usually more effective than repeatedly restarting the process without changing conditions.
Treat the update like a one-time maintenance task that needs stable environment and timing.
- Update indoors in a quiet location with strong phone signal and no distractions
- Fully charge all devices before beginning
- Use the original charging equipment when possible
- Keep the controller, drone, and phone close together during pairing
- Do not press buttons or move cables once the update starts
- Wait for the app or LEDs to confirm completion before disconnecting anything
For best results, avoid doing the update immediately after flight.
Let the battery and electronics cool first, then start from a clean power cycle.
When to Contact Holy Stone Support
Some update failures point to a deeper software or hardware problem.
Contact Holy Stone support if the controller still fails after a clean retry, especially if the same error returns every time.
Useful details to provide include the controller model, drone model, app version, phone operating system, firmware version if visible, and the exact step where the process fails.
Screenshots, LED behavior, and error messages can also help support diagnose the issue faster.
What Not to Do During a Firmware Update
Firmware recovery is often successful, but only if you avoid common mistakes that can make the problem worse.
- Do not disconnect power while firmware is writing
- Do not close the app until the update is finished
- Do not use random firmware files from unofficial sites
- Do not start the update with a weak battery
- Do not interrupt the pairing process by switching devices
If the Holy Stone HS175 controller firmware update failed once, a rushed second attempt can create a longer recovery cycle.
A stable retry with verified files and full power is the safest approach.
How to Reduce Update Problems in the Future
Keeping the controller updated is important for compatibility, but good habits matter more than speed.
Check firmware release notes when available, update only through official Holy Stone channels, and make sure your mobile device remains compatible with the app.
It also helps to keep a short record of successful firmware versions, especially if you fly often and use multiple batteries or phones.
That makes it easier to recognize whether a future update caused a new issue or simply repeated an old connection problem.