"..... bug that caused him to lose his voice."
Is it the same bug that affects Android voice prompts over Bluetooth?
One day somebody will produce a Phone OS that can download official update patches for stupidities like this, rather than leaving the user hoping against hope that a) it'll be fixed in the next full release and b) that release will be made available to their device. I'd buy it.
Until then, rooting and applying some charitable hacker's patch will have to do.