Final documentation on How to build the display, here:
https://opensourceebike.github.io/
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Because 850C / 860C display are expensive, suddenly fail and were done to not be repaired, I now have our simple, DIY, easy to repair display, based on the SW102 display. It works very well but still needs some more firmware development, mainly to refine some things.
Here is a video of the display working on my EBike with TSDZ2 motor: