Htrc T240 Duo Firmware Update ((link)) <RECENT • 2026>

Gather your Mini-USB cable, download the latest firmware, and follow the steps above. Your batteries will thank you.

: Adds or refines support for LiHV (Lithium High Voltage) batteries up to

Ensure no background software is interfering with the USB ports and try running the update tool again.

Monitor the progress bar. Step 5: Verification and Calibration Htrc T240 Duo Firmware Update

Once the progress bar reaches 100%, the utility will display a "Success" or "Verification OK" dialog box.

Disclaimer: Firmware updates are done at your own risk. Incorrect updates may render the charger inoperable. If you want to ensure your charger works optimally, How to after an update? How to troubleshoot a failed firmware update ?

Before attempting any software modifications, please be aware that HTRC issued a major recall (a related model) due to overheating and fire risks Recalled Models: Primarily the " " sold between December 2017 and June 2024 Action Required: Gather your Mini-USB cable, download the latest firmware,

The proprietary HTRC flashing utility requires a Windows environment (Windows 10 or 11 preferred). macOS and Linux are not natively supported.

Wait approximately 45 seconds for the process to finish. Do not disconnect the power or cable during this time.

A data-compatible USB cable is required to connect the charger to a PC. (Ensure it is not just a charging cable). Monitor the progress bar

| Issue | Likely fix | |-------|-------------| | “Device not found” | Wrong COM port or missing CH340 driver. | | Update fails at 0% | Charger must be powered ON after clicking “Update” (some tools need power before, some after – read included readme). | | Buttons unresponsive after update | Re-flash the same firmware again. | | Screen stays black | Contact HTRC support – the bootloader may be corrupted. |

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The official HTRC ISP (In-System Programming) software runs natively on Windows.

Once the tool displays "Update Successful," disconnect the USB cable.