Imax B6ac V2 Firmware Update |link| (INSTANT 2026)

If you actually need the firmware update instructions for the iMAX B6AC v2 (hardware version check, USBasp method, and avoiding bricking), just say the word — I’ll switch from storytelling to tech support.

Enables charging of High-Voltage Lithium batteries (4.35V per cell). Stability Improvements:

Cheali firmware is designed for the older iMAX B6 (non-AC, ATmega32-based). It does not officially support the B6AC v2 due to different hardware (STM32F103 on genuine v2 units). Flashing Cheali onto a B6AC v2 will almost certainly brick it . imax b6ac v2 firmware update

If your B6AC v2 is out of calibration or behaving badly and you don’t want to risk a firmware flash:

Battery technology evolves rapidly. When the B6AC V2 was first released, certain variations of LiHV (High Voltage) or newer LiFePO4 cells might not have been fully supported or calibrated correctly. Firmware updates often include charging curves for newer chemistry types, ensuring your charger can safely handle modern batteries. If you actually need the firmware update instructions

⚠️ (including calibration). Document your current calibration values before starting.

To safely initiate the update, you must put the charger into a specific "System Update" state: Download - SkyRC Here to download product manual, PC software and APPs. Go! iMAX B6AC V2 Charger - SkyRC It does not officially support the B6AC v2

Before diving into firmware, let’s clarify the device. The SkyRC iMAX B6AC v2 is an upgraded version of the legendary B6AC. Key features include: