This is usually a driver or cable issue. Try a different USB cable or a USB 2.0 port if you're using a 3.0 port.
were recalled in late 2024 and 2025 due to a "fire hazard" where the chargers or connected batteries could ignite. Recommendation
Ensure your charger is connected to a stable AC power source. The specific HTRC ISP (In-System Programming) tool. 📥 Step 1: Download the Files Visit the official HTRC website (ht-rc.com) or the authorized retailer’s support page. Navigate to the Search for "T240 Duo Firmware." Download the firmware file and the Update Tool (usually a .zip file). Extract the files to a folder on your desktop. 🔌 Step 2: Connection Procedure plug the USB into the charger yet. ISP Update Tool on your PC. Locate the Micro-USB port on the side of the T240 Duo. Connect the USB cable to your PC first. Hold down the Channel button Htrc T240 Duo Firmware Update
Attempting an without the right tools is a recipe for frustration. Do not proceed until you have the following:
Check:
| Problem | Likely Cause | Solution | |---------|--------------|----------| | PC does not detect charger | Bad USB cable or missing driver | Use a known good data cable. Reinstall STM32 drivers. | | Updater tool crashes at 50% | Interrupted power or wrong firmware file | Re-download the file. Ensure AC power is stable. Restart from Step 4. | | Charger screen goes black after update | Incomplete flash | Perform a “recovery flash.” Put charger back in DFU mode and re-upload. | | Error: “Target not found” | Wrong COM port or charger not in DFU | Check Device Manager. Repeat DFU mode procedure. | | New features not appearing | Updated wrong variant (e.g., T240 non-Duo) | Double-check model number. Download correct firmware. |
: Do not disconnect the USB cable or power down the charger during this phase to avoid bricking the device. This is usually a driver or cable issue
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