You mean - aftermarket device for Škoda
It doesn't matter at all for which car. It's a Android device, almost the same as a mobile phone

When the root of the internal memory is mentioned, it is not meant root of the device's system partition
It is thought that the iGO folder should be placed exactly in the root of the internal memory and not in some subfolder

In order for TTS to work, you must have the appropriate engine installed and appropriate TTS lang and voice files inserted
Use Alfanum TTS 1.1.1 klon apk, and
lang_Serbian_Latin_Danica-Universal_v10.12.2024-MOD_(Mapa-Latinica)
Voice_Danica_Srpski-TTS-Universal_v4.6-MOD