Use magiciso and start with a mode2 image and save (not save as), that way it retains the correct format.

or use mode2convertor. (this is what I use).

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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.