my ebook formats are epub and mobi. it happens with both.
Im not sure about the Coolreader. I loaded tirwal 2.9 updated the firmware and just turn it on and read. is there a different way to view the books using Tirwal ?
i know ive loaded 2.9 correctly as I had lost all mobi format ebooks when i upgraded to the latest firmware from the mybebook website and they came back when i loaded the Tirwal firmware