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Originally Posted by ali
Essentially we know that - it stores packages in some directory, and they're executed from start.sh / do_updates.sh on reboot. So this doesn't help if the OS is screwed, as it doesn't really reflash. (I assume you were thinking about that)
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This is partly right, partly wrong. The 2.4 miniupdate stored a package with a new waveform and then a script in rc.d/ so it was executed.. at shutdown!
Then the 2.5 update did the designed update method, running from the script in /old-root (the initial run). This script runs instead of "init" when the machine starts-up, and then it chroots and switches into init. The script checks for the presence of files in the update directories and for the raising of a pair of flags somewhere in the hardware.