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Different upgrade and update strategies exist when it comes to embedded Linux system. If at development time none of these strategies have been chosen, adding them afterwards can be tedious task.
Even harder it gets when the system is already deployed in the field and only accessible via a 3G connection.
This talk is a developer experience of putting in place exactly that. Giving a return of experience on one way of doing it on a system running Barebox and a Yocto-based distribution.