Gahh, re-entering because my login timed out before I posted and it doesn't store your text for after you log in (and I didn't copy it either).
At the time of the problem, the power button would not power off/on or sleep/wake. No response unless I held it down until my fingers cramped (longer than 30 seconds indicated for rest) and then all it would do was go to blank screen with up to 2 of the 4 to 5 squares lit and flashing and then just hang there.
Since resolving, power button logs off/on and sleep/wakes as it should.
I don't recall exactly which letter I hit the limit on space, but it was near the end of the alphabet (W's maybe?). Realizing I could not fit my entire library, after the reset I imported all my unread books, then my read books by year read starting with most recent. I got to 2011 or 2010 before maxing out. I didn't go book by book to hone in on exact limit. Stopping with last successful "chunk", I have 1.96 GB available on the device -- that's including downloaded Pocket articles and I'm able to download at least one library book.
Researching problems with the firmware, I did run across several posts, like this one:
http://blog.the-ebook-reader.com/201...kobo-ereaders/
where many commenters report issues with the device(s) freezing and hanging, so I don't appear to be the exception.
If there is such a patch to keep from receiving pushed firmware updates, I'd love to find it. One of the commenters on the above post noted they were able to enable the wifi without fear of receiving update by adding a new Kobo.com account without billing information. I've done that, but I fear that simply adds you to the Push queue further down and that eventually I will again receive the unwanted update.
Side notes: I did find upon closer inspection that the one book I could not fix with Calibre edits in order to import to device was, in fact, a Nook Sample which mistakenly entered my Calibre library. I just deleted it.
And I think I have confirmed that the reason I don't see this device listed in Overdrive.com under Linked Devices, even though it is recognized by ADE and I have authorized it, is because it does not use ADE to download books from the library because of the built-in feature of the KA1. At least that's how I'm interpreting based on info about the Nook Glowlight Plus and some Sony readers here:
https://help.overdrive.com/customer/...gital-editions