In this article I will share a step-by-step process How to Update Shimano Di2 12-speed Shifter Lever Firmware through a wired DI2 cable connection. It is a fairly easy process that every home mechanic can do with the proper tools/spare parts and the Shimano E-Tube App. My Canyon Ultimate came with Shimano Cable Tool with product# TL-EW300 and the Shimano E-Tube App was already on my Google Pixel 10 Pro smartphone.
