If firmware isn't available, you can still improve your charging experience: Manual Calibration
More importantly, serious safety concerns have recently emerged regarding HTRC chargers: Safety Hazard & Recall
Here’s a helpful post for anyone looking to update the firmware on their charger.
If you are attempting to update firmware to fix specific bugs, these are known persistent issues with the that typically cannot be resolved through user updates: Calibration Loss
Can handle two different battery types simultaneously with a total power distribution of 150W in AC mode. Integral Drones Shenzhen Haitan Technology
Supports cell voltage monitoring and calibration specifically for 6s lithium batteries. Dual Charging: