Solved. You can swap out the head unit from a similar year/model with no need for coding. My issue was at the back with the bm53 module gone faulty and the radio amp. Only realised recently I was getting water in the rear compartment. Went through three radio amplifiers before I realised. Now everything works fine and I am getting on to cleaning out the drain pipes for the sun roof or whatever. Thread solved.

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2005 X5 4.4i M Sport
2003 X5 4.4i