All firmware versions have hyphenation capability. Some recent firmware versions are missing the actual hyphenation dictionaries, but in most cases the dictionaries from an earlier version will still be on the device so it won't matter. (If for some reason a device is lacking the hyphenation dictionaries, they are easy enough to install).
Hyphenation in epubs generally works much better than in kepubs, but in firmware 3.5.0 - 3.8.0 the first line of an epub paragraph will not be hyphenated if it has a non-zero text-indent. This is a bug in the Adobe RMSDK that has been fixed in later RMSDK versions than the one used in firmware 3.5.0 - 3.8.0.
You can modify the hyphenation dictionaries and reinstall them to change some of the hyphenation settings.
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