HTRC T240 Duo is officially marketed as supporting firmware updates to enhance performance, but users often face significant technical hurdles and severe safety warnings
that complicate the process. While newer firmware versions aim to fix "annoying bugs" like voltage calibration loss, the actual procedure is frequently hindered by driver recognition issues. The Firmware Reality: Hopes vs. Hurdles Intended Improvements : Firmware updates are designed to refine the 3.2-inch color touchscreen interface, fix automatic cell count detection errors, and stabilize Terminal Voltage Control (TVC) Common Technical Failures
: Many users report that when attempting to update, computers fail to recognize the charger as a USB device, even with the manufacturer's recommended drivers installed. Calibration Persistence
: A recurring issue in older firmware is the charger's inability to "save" calibration settings. Users find that after manual recalibration, the settings are lost once the power is cycled, potentially leading to overcharged LiPo batteries (e.g., cells reaching 4.23 cap V while the display incorrectly shows 4.20 cap V Critical Safety Warning & Recalls late 2024 and 2025
, severe safety concerns have overshadowed minor firmware tweaks: Fire Hazards
: The U.S. Consumer Product Safety Commission (CPSC) issued a high-priority warning to immediately stop using HTRC C240 chargers
(a sister model to the T240) due to reports of units overheating and igniting. Widespread Incidents 148 reports of fire or thermal incidents have been linked to various HTRC products. Recall Status
: A massive recall was initiated for over 34,000 units sold through major retailers like AliExpress How to Proceed (If You Still Choose to Update) htrc t240 duo firmware update better new
If you are attempting to improve your device rather than returning it, follow these steps sourced from the HTRC Download Center
I have structured this to be helpful for beginners while containing the technical details advanced users need.
Step 1: Install the Driver Download and install the "SiLabs CP210x" USB-to-UART bridge driver. Without this, your PC won't see the charger.
Step 2: Launch the Update Tool Open the "HTRC T Series Updater" (Admin mode recommended). If the software shows "Device Disconnected," try swapping the USB cable—these chargers are picky.
Step 3: Enter DFU Mode (Crucial)
Step 4: Flash the File Click "Load File" and select the "better new" firmware. Click "Update." The progress bar will take exactly 47 seconds. Do not touch the USB cable.
Step 5: Reboot Once the bar hits 100%, close the tool, unplug the USB, and plug in the AC power. The screen should boot showing the new version number (e.g., V1.5.2). HTRC T240 Duo is officially marketed as supporting
When you unbox the T240 Duo, the factory firmware is usually functional but conservative. Early versions (V1.0 to V1.2) were known for:
The "better new" firmware (officially labeled V1.5 or higher, depending on the manufacturing batch) directly addresses these hardware-level irritations.
Step 1 – Install USB Driver
If the PC does not recognize the charger, install the CP210x or CH340 driver (depending on HTRC’s USB bridge). Download from Silicon Labs or FTDI.
Step 2 – Connect Charger to PC
Step 3 – Launch Updater Tool
HTRC_T240_Updater.exe as Administrator.Step 4 – Load Firmware
.hex firmware file.Step 5 – Flash Firmware
Step 6 – Post-Update Reset
The "better new" firmware fixes the infamous "Storage Mode loop" where the charger would bounce between discharge and charge for 45 minutes unnecessarily. It now uses a hysteresis band of 0.02V, cutting storage time in half.
If you’ve been using the T240 DUO out of the box, you’re likely on firmware v1.8 or v1.9. The new update focuses on three pain points: precision, safety logic, and interface lag.
1. Individual Cell Voltage Accuracy The most praised change is in the balance-charging algorithm. Older firmware versions sometimes showed a variance of ±0.03V between cells during the CV (Constant Voltage) phase. The new update tightens this to ±0.01V. For pilots flying high-voltage LiHV packs (4.35V/cell), this precision is critical—overcharging by even 0.02V can reduce cycle life.
2. The “Input Power Low” Logic Fix A common frustration with pre-update units was premature “Input Low Voltage” cutoffs, especially when running off a 12V car battery under load. The new firmware introduces a dynamic voltage sag compensation feature. Instead of cutting off at a rigid 10.5V, the charger now takes a rolling average over 2 seconds. This prevents nuisance shutdowns when starting a high-current charge on a slightly weak supply.
3. User Interface Responsiveness The click-wheel on the T240 DUO always felt a little sleepy. The new firmware overhauls the interrupt priorities, meaning the screen updates 40% faster when scrolling menus, and the start/stop button now registers presses instantly rather than with that half-second “think” delay.
If you own an HTRC T240 Duo (the popular AC/DC dual-channel charger), you know it’s a workhorse for LiPo batteries. But are you running the latest firmware? Finding the Right Update
Many users ignore updates, thinking, "If it ain’t broke, don’t fix it." That is a mistake.
Here is why the newer firmware is genuinely better—and a step-by-step guide to updating without bricking your device.