The firmware, unless I am way off base, is the OS of the eReader. Sometimes there are bugs and yes, they are looked into and addressed. Usually the next version of firmware corrects those bugs. I don't know about other eReaders, but the PocketBook 301+ does allow you to install any font you'd like. Again, not sure about the others, the PB 301+ can make the text absolutely massive or extremely tiny, to the point where it's nearly impossible to read.
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