Welcome to the forums,

I had exactly the same thing with a Gen3 ULF I had, I updated the ULF to a Gen12 and it's perfect.

Your ULF is too old to retain the phonebook, it's a memory thing and not fixable (believe me I tried).

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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.