The Shimano SM-JC41 Di2 Internal Frame Junction Box 4-Port links to four points with SD50 E-tube wires: front derailleur, rear derailleur, cockpit junction box, and battery mount. Ensure uniform firmware for all Di2 components to prevent malfunctions. Use
The Shimano SM-JC41 Di2 Internal Frame Junction Box 4-Port links to four points with SD50 E-tube wires: front derailleur, rear derailleur, cockpit junction box, and battery mount. Ensure uniform firmware for all Di2 components to prevent malfunctions. Use the Di2 system checker for firmware updates at http://e-tubeproject.shimano.com/.
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