I'm not sure. For example, flashing logo can make the bootloader crash, as it draws that logo. This would "brick" your device, and you won't be able to flash it again.
On the other hand, flashing voice data should be harmless. Here is one more GCD with only voice data inside: [Only registered and activated users can see links. ]
And I have your device's region dumps, so you can always go back (if you don't brick your device, of course!).
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