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I've made a complete backup with my current firmware version. Next I plan to upgrade to a new firmware version. Then I might want to get back to the firmware and settings I have now. In that case I suppose I can simply dd everything from the backup to downgrade as outlined in my complete restoration plan above. So /var/local from backup will match the firmware version from the same backup unless I misunderstand something.
If restoring localsys.bin makes sense, a question remains: when is it safer to do this - in the first step from the diags mode or in the second step from the main mode?
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