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Diagnosing a Shimano electronic groupset starts with a systematic check of each component’s connection and battery status—inspect junction boxes, derailleur batteries, and wiring for corrosion, loose plugs, or damaged housing—then connect to Shimano E-TUBE Project software to run a full component survey that reports firmware versions and error codes; next update firmware by following the E-TUBE prompts to sequentially flash the latest firmware to the Di2 battery, junction, front and rear derailleurs, STI levers, and any wireless units, ensuring a stable USB/Bluetooth link and not interrupting power during updates; finally perform a shifting check by setting the bike on a stand, cycling through all gear combinations while observing smooth engagement, indexing, trim, and chain line, adjusting limit screws and B-tension as needed, calibrating derailleur alignment in the software if available, and re-running the E-TUBE diagnostic to confirm no faults and consistent firmware across components before a final road test.
Diagnosing a Shimano electronic groupset starts with a systematic check of each component’s connection and battery status—inspect junction boxes, derailleur batteries, and wiring for corrosion, loose plugs, or damaged housing—then connect to Shimano E-TUBE Project software to run a full component survey that reports firmware versions and error codes; next update firmware by following the E-TUBE prompts to sequentially flash the latest firmware to the Di2 battery, junction, front and rear derailleurs, STI levers, and any wireless units, ensuring a stable USB/Bluetooth link and not interrupting power during updates; finally perform a shifting check by setting the bike on a stand, cycling through all gear combinations while observing smooth engagement, indexing, trim, and chain line, adjusting limit screws and B-tension as needed, calibrating derailleur alignment in the software if available, and re-running the E-TUBE diagnostic to confirm no faults and consistent firmware across components before a final road test.