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Brun
@hippy
https://bettershifting.com/frequently-asked-questions/how-do-i-update-my-sm-bcr-2-charger-so-that-i-can-use-e-tube-project/
This is why I don't plug my bike into a computer...
"If you've installed E-Tube Project 4 and you're using the SM-BCR2 charger then you may have gotten a cryptic message starting E-tube Project:
E-Tube Project tells you to update the SM-BCR2 charger before you can actually use E-Tube Project. Unfortunately, the only way to update the SM-BCR2 is by using E-Tube Project.
The workaround is simple: you install previous version of E-Tube Project, version 3.4.5, and use that to update the charger. Once that is done you can safely use E-Tube Project 4.0.4. Keep in mind that, while most issues shave been fixed, there are still some bugs left in version 4.0.4 and E-Tube Project 3.4.5 may actually work better.
Download E-Tube Project 3.4.5 on the Shimano E-Tube Project site or use this link: api.shimano.com/etube/public/data/upload/published/E-tube_Proj_V_3_4_5.zip
https://www.mamilian.bike/blog/2021/12/shimano-e-tube-5-0-3-incompatible-with-sm-bcr2