For hobbyists in RC (radio-controlled) cars, drones, planes, and multirotors, the charger is the unsung hero of the workshop. Among the most popular and enduring chargers is the — a compact, 80W AC/DC balance charger known for its reliability and versatility. However, like any sophisticated piece of hardware, its performance depends on the firmware running inside.
With charger powered off, press and hold the button (or INC , varies by batch) while connecting power. The screen may stay blank or show “WAITING FOR UPDATE”. Then click “Update” on PC.
Updating the firmware on the IMAX B6AC V2 is not as simple as updating an app on your phone. It requires specific hardware and software tools. Do not attempt to start until you have the following: imax b6ac v2 firmware update
If you’ve ever searched for an “iMAX B6AC v2 firmware update,” you’ve likely encountered confusion, conflicting information, and even warnings. This article will demystify the process, explain whether you should update, and provide a step-by-step guide to doing it safely.
Here are the primary reasons you should consider an update: For hobbyists in RC (radio-controlled) cars, drones, planes,
| Problem | Likely cause | Solution | |---------|--------------|----------| | Updater doesn’t detect charger | Wrong COM port, or charger not in bootloader | Check Device Manager; retry button hold at power-on | | Flash fails at 50% | Bad connection or wrong firmware | Check TX/RX crossed? Use lower baud rate (57600) | | Charger dead after update | Incorrect firmware (e.g., B6 non-v2 file) | You’ve bricked it. Only factory recovery via ISP programmer (AVR Dragon) – not for beginners | | Voltages wildly wrong after update | Calibration lost | Recalibrate using multimeter | | “No response from device” | TTL voltage mismatch (3.3V vs 5V) | Use a 5V-tolerant adapter (CP2102 often works) |
Marco’s iMAX B6AC v2 had been flawless for two years—until it wasn’t. One Tuesday, it started beeping at 4.2V per cell as if 4.19V was an insult. Then the calibration drifted: a 5000mAh pack charged to “4782mAh” and stopped. His drones felt it first—shorter flights, uneven cell voltages after storage. With charger powered off, press and hold the
The “v2” designation is critical because older B6 and B6AC units (non-v2) have different hardware and firmware ecosystems.
If your computer doesn't recognize the charger, it’s usually the . Try manual installation from the Device Manager or swap to a different USB port.
SkyRC does not maintain a public changelog, but based on user reports and factory releases, here are the known versions: