The official FlySky update tools are designed for Windows.
Firmware is the operating system that controls the hardware inside your transmitter. Just like your smartphone needs iOS or Android updates to fix glitches and add features, your FS-i6S needs firmware updates to function at its best. flysky fs-i6s firmware update
“Powerful budget radio, let down by a clunky, risky update process. Works perfectly once updated – but getting there tests your patience.” The official FlySky update tools are designed for Windows