barium
This would work with any CFW as all allow to execute shell scripts on startup and that's what you'd need.
But remember:
This is a low level change that WILL confuse reader software.
It's not compatible with Reader Library until you find and modify corresponding XML file in it.
It WON'T work with books that you've already opened as they contain formatting information, which is wrong, because you've change font scale, but reader doesn't know it.
It will mess up your notes as well (for the same reason)
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