MobileRead is my main source of information, I only check the thread on the-ebook.org to see if there's a new version available. The rest is trial and error
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The second part is for someone else to answer, I only use it to replace the default fonts, but I'm eager to learn new tricks.
Btw, what happens if the internal memory is formatted (manually or automatically, it happened with my old 600) while the fonts from test-startup are loaded?