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Brun-
Don't do that. It will appear to work for a while, then drop the connection. There will be swearing. You will fix it using the pc app, eventually.
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Dunno. Never done a firmware update. My stuff works how I want and it's airgapped so I figure updates = pain. Grrl's bike is a mashup and the syncro shift has never worked. All her components are up to date according to the software (presume the shop did this when they did the groupset swap).
Five-Hats
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