I've been using this firmware on the KA1 with KEPUB files converted by the Kobo driver during sending with Calibre. Everything seems to work fine, but there seems to be an anomaly in chapter counting.
When setting the header to "Percent Read" it says (for this chapter): 5%.
The dialog in the "Reading Progress" menu says 0%.
When I turn a page, the header says 10%, the dialog says 5%.
The header counts pages as having been read as soon as you switch to them; the dialog in the Reading Progress counts as if you have yet to read the page.
Not a big problem, but I wonder why they count differently. That could just be the same function
I have used the KA1 with the full screen font hack (and later the official full screen support) for three years, but now that the header can actually display chapter time to go in minutes (and accurately too) and the footer pages - total pages with one screen being one page, I actually like the header and footer to be enabled.