@pnpires : you're welcome. As Alan_S said if you only use koreader you don't really need to update nickel.
@NiLuJe : I only updated one time in 2 years and it was for giving you a proper strace log
@Alan_S : yup at the end, I think a choice has to be made
@JazzyJ : you won't find too much people for discussion about that on this forum, but you could go on
https://www.mobileread.com/forums/fo...play.php?f=223 ; where it is debated at each new firmware release =) I only answered because the question was about koreader; I don't use nickel anyway and when it comes to reference books I go with paper.