Once the tool displays "Update Successful," disconnect the USB cable.
: Connect the charger to your PC via the USB port located on the side of the device. Htrc T240 Duo Firmware Update
| 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. | Once the tool displays "Update Successful," disconnect the