Thread: Shimano DI2 Electronic Programming- Do I need the programmer?
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Old 05-10-16 | 11:21 AM
  #3  
thermalattorney
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Bikes: '04 Cannondale Track, Custom Steel Disc Road Di2, Rock Lobster CX

If you're using the 3-port (SM-EW90-A) or 5-port (SM-EW90-B) junction boxes you don't need the programmer. The USB charging cable can be used to plug into a Windows computer. If you have older e-tube Di2, you need the programmer. However, it's cheaper to buy a new junction than the programmer.
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