I think you're referring to the Benjie T6/Rocker. The firmware versions for those are interchangeable because the hardware is identical. There's also a Rockbox port in progress for that player too.Thanks crab. One more question can another firmware be used to get more functions? I've seen other threads where they can use firmware from another player that has the same UI. Just curious.
But for the IQQ I can't see an option to upgrade the firmware so not sure if it's possible.