You should be able to find the boot tune by looking through the folders in the file manager (if it has one) or download one (file manager) from the play store.
Are you able to reproduce the plastic surround on the original dash (where it shows AUX) in your pic and add some sort of addition to it, maybe in the centre strip above the LCD display to connect to the back of the head unit?
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'08 V50 2.0D
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