Quote:
Originally Posted by davidfor
When downgrading firmware, you should do a factory reset. But, in most cases, if you are only going back a version or two, you are safe. In this case there is a database change between 3.17.3 and 3.18.0 that could cause a problem. A column was removed from the user table. If the 3.17.3 might fail if it attempts to use that column. But, looking back, it looks like you are planning to go back to 3.12. In that case, I would recommend the factory reset....
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Again, just for folks' information, I downgraded from 3.18 to 3.17.3 without doing a factory reset, although I unpatched first. Turns out that I'm getting a double flash (no black bar) occasionally upon chapter changes that I don't remember getting before on 3.17.3, so I'll now try to restore 3.17.3 after a full factory reset and report what happens. The tip above to simply copy your books first makes it easier, for sure.
EDIT: Full reset appears to be helpful and to have corrected the double flash I described.