How to change Shimano Di2 shift modes (Synchronized Shift, Manual, Semi-Synch)

Shimano Di2 Shift Modes explained and demonstrated.

What are Semi and Full Synchro Shifting modes and how to change Shift Modes.
How do Shimano Di2 automatic shift modes work?
How does Di2 shift in semi and full synchro modes?

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Demonstrated on Ultegra Di2 Groupset.

Time Codes:
0:00 Intro
0:15 How to check and change shift modes. What the di2 lights mean.
1:13 Semi Synchro Mode Lights
1:29 Full Synchro Mode Light
1:32 How to change Di2 Shift Modes
2:03 Semi-Synchro mode Explained& Demonstrated
2:51 Full-Synchro Mode Explained & Demonstrated

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