Originally Posted by wrenn1
What does "K4S" and KB stand for please and thank you?
K is for "Kindle". 4 is for the major firmware version number, which is 4.x on the Kindle 4 (Mini) that sold for $79USD, and also the new $69 Kindle. That is what we mean by K4. In this forum, people have been appending S for "Silver" or B for "Black" bezel colors (K4S and K4B). You may also see KPW for "Kindle Paperwhite" in this forum as well.