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Like any computer the software can have bugs or glitches or not perform as desired. Occasionally due to customer feedback / reoccurring faults / FASTA diagnostic data / performance requirements / emissions data / fuel economy... BMW tweak the ecu firmware. These small changes are often advantageous to customer and or BMW.
The most recent major one I can think of is the CAS module update which prevents thieving bast*rds with cheap key programmers from programming a blank key and driving your car away!
Once your modules have been updated by ISTA P 2.53.3 for example at a dealer or Indy or indeed at home if you have the kit, You'll need 53.3 sp-daten to code your cars modules (digital speedo etc etc etc)
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