I have the 2.1.5 firmware and I read books from an SD card.
It's very stable and much quicker than the 2.1.1 firmware. (No reboots!)
I also manually updated it. However whilst I live in Australia now, when I bought it (shortly after the first KTs were released in the US) I was living in the UK, although imported it from the US, so perhaps the currently manually downloaded firmware is optimised for US KTs?
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