Let's say I've a working run-time system running 2016 April release (Krogoth) 
Poky image.  I've it installed previously from a USB thumb drive onto a much 
bigger SSD with all partitions setup.  I don't need to change the partition 
from here onward.

Is there an easy way to replace it with, say 2017 Oct release (Rocko) Poky 
image (and vice versa)?  E.g. by replacing just one file (e.g. bzImage)?  Or is 
there a script that would take care of it?  What happens to all the existing 
directories, e.g. /etc, /bin etc.?

I've been trying to adapt init_install.sh under 
poky/meta/recipes-core/initrdScripts/files, but it seems to assume I've a 
separate device (like USB drive).

Thanks,
Raymond
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