@mmyhassan
The language of the voice chosen in Settings > Regional > Voice Language prevail over everything else.
If you are from Saudi Arabia e.g. you can do a test by placing the ui_nextgen folder at the root of your iGO.
Inside it has the audio subfolder with two other folders DA-SC1025 (Saudi Arabia) and the .wav files are recorded in the English language.
Spoiler: download
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