: Format a microSD card to FAT32 (minimum Class 4 recommended).
: The update resolves a critical bug where older firmware failed to detect minor voltage drifts, which could previously lead to "balance errors" or even cell swelling. How to Check Your Current Version htrc t240 duo firmware update better new
: Get the latest firmware file (e.g., htrc_t240duo_v2.3.0.bin ) and the HTRC Firmware Update Tool (v1.5.2 or newer) from the Official HTRC Website . : Format a microSD card to FAT32 (minimum