i can't just try each firmware, because the some chipsets are not flexible.
according to wikipedia
The firmware used in various S1 MP3 players differs significantly, but this is not widely understood. Problems have arisen as consumers have attempted to upgrade their players using incompatible firmware with a higher version number. This can permanently damage the players.
from s1mp3.org
Those firmwares are to be used ONLY for developers and people wishing to recover their _dead_ players. You have a 99% of chance to kill you player if you flash it without checking the Board ID! i.e., make it inoperable INSTANTLY, probably BEYOND REPAIR. (See Board ID: device real identification)
If you got a dead device, please check the Dead recovery guide
i just need a firmware for this ACT209X_S75_SZG type.
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