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New devices have new software and new firmware whose concept is absolutely different from the old ones. Forget about GCD files, that's not how it works anymore.
In principle, the procedure and principles are identical to those of Android mobile phones, also as for smartphones in general
Yes, when upgrading, not when downgrading
If there are tools on Garmin's website and if this option is provided, it is only possible to do it using them.
And as far as I know, there are no more downgrades for these and similar models. That option is probably disabled.



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