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Hi Snaver, Welcome to the Forum.
I don't know how much you know about EPUB and CSS but I think you need to have a look at the CSS file zipped up inside the EPUB.
If you don't know how to look inside an EPUB come back and I'll try to be more specific.
If you do then, look for entries in the CSS file that specify "font-size"
e.g. font-size: 12pt;
or font-size: small;
or font-size: 1.5em;
or font-size: 120%;
I'm no expert but I think if font-size is specified "absolutely" (e.g. in point or pixels) then the zoom button on the PRS-600 has no effect (I have a Sony PRS-505 not a 600 but it's probably the same).
However, if font-size is specified "relatively" (e.g. 120% or 1.2em) then the zoom button will work as you expect.
Once you know how your EPUB is currently set up you can formulate a plan on how to tweak it to your liking.
If the EPUB is not too large I'd be happy to look at it if you want to attach it.
P.S Do you use Calibre? If so this may be another way to change the font-size.
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