Welcome to the forum mate.

Press and hold the pair button,
wait 3 seconds
turn on igniton (stage 1)
still holding pair button, wait for 10 sceonds, untill a beep is heard.
release pair button

All paired phones are now deleted.

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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.