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Yes, that is true for example for the Polish variant of M92 with better TTS software.
In case of ICARUS eXcel, I would search russian forums or look at pages of russian official distributor. There will be the latest official firmware for the device.
I've read, that firmware for 'standard' M92 is not possible to install on M92 without audio output. One of the reasons is, that the instalation procedure tests functionality of audio and if it does not work the instalation of firmware is aborted.
Also should be mentioned that installing "non-official" firmware might void the garanty for the device and that any update of firmware might brick one if things go wrong.
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