It sounds like you had a problem with either the burning or a corrupted navboot file (what version of navtweak did you use)?

What splash did you use?

Follow Jochens advice and change the language in navcoder, that it way it works properly as OEM.

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Sept 03, M3, Silver Grey. Retro-fits: Modded Mk4 DVD Drive, OEM Bluetooth, VR Control, Rainbow Speaker Upgrade, Sony SOT Amp, HK Sub, CCFL, Intravee II, NightMode.