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Connect your shift lever to the battery
This method is great if you can easily get to your battery. Most
bike manufacturers put the battery in the seat post, and therefore getting to the battery is pretty easy.
Note down your saddle height if you haven't already, then take out the seat post to get to the battery.
Now take a long (1200mm - 1600mm) EW-SD300 wire. Plug one end into the battery and the other into the shift lever you want to update.
You can now use the mobile app to update your shift lever.
Note that if the E-Tube Project app is not registering the newly wired connection, you can fix this by disconnecting the app and then reconnecting to the bike.
Update the shifter, repeat the process for the other lever, and you're done.