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I bought a second hand bike with an existing Ultegra DI2 6770 groupset, which is a 10-speed group. I would like to upgrade the components required in order to have syncro shift on it.

As far as I know syncro shift is not available for 6770 (10-speed Shimano Ultegra Di2). For 6870 (the first 11-speed Ultegra Di2 version), Synchro shift is available if we update the battery to the BT-DN110. (Note: the battery houses the computer system that enables Synchro shift.)

Thus I am wondering what components I need to upgrade from a 6770 groupset?

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    6770 is 10-speed, 6870 os 11-speed. Offhand, you're going to need at least the rear derailleur, 11-speed cassette, and an 11-speed compatible rear wheel. You'll probably need more, though. – Andrew Henle Sep 4 at 12:53
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    @AndrewHenle are you sure? The latest Di2 compatibility chart explicitly says that the DN-110 battery is compatible with 6770 levers. That battery has the hardware that enables synchro shift on 11s groups. This implies that the OP could update to this battery, update his/her component firmware, and enable Synchro shift. However, I'm having trouble finding reports that people have actually done this and got Synchro shift to work on their 10s Di2 groups. e-tubeproject.shimano.com/pdf/en/HM-CC.3.4.3-00-EN.pdf – Weiwen Ng Sep 4 at 12:57
  • @WeiwenNg That compatibility chart doesn't say using an RD-6770 results in an 11-speed system. I assumed that after the upgrade the OP wants an 11-speed system, and I'd be extremely surprised if Shimano (or any other manufacturer...) made a 10-speed high-end electronic rear derailleur that only needs a firmware update to be an 11-speed high-end electronic rear derailleur. – Andrew Henle Sep 4 at 13:35
  • @AndrewHenle I see. My initial reading of the post was that the OP was just asking what they need to do to get synchro shifting on their 10s group. Going back to what they originally wrote, I still think this is the more likely interpretation. Also, if the shifting parameters are given by the battery computer and none of the important derailleur dimensions changed, then the 6770 RD should have been convertible to 11s through a firmware update. That means it could have been technically possible. I agree that most manufacturers probably wouldn't go and actually do it. – Weiwen Ng Sep 4 at 15:11
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I just installed a Di2 6770 10spd front and rear derailleur with a BT-DN110 internal battery.

I can confirm that once I update firmware on all the components, eTube does NOT allow me to set up synchro shifting.

Very disappointed considering the battery has all the hardware necessary to support it.

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