Read this:
https://www.mobileread.com/forums/sho...d.php?t=169645
You can repair your kindle from diags mode. Additional tools will be provided soon to make it easier.
BTW: Kindle touch is not a K4. Some early posts when it first came out were a little confused on that issue. The number following the K is the generation / firmware major version number, and the latest touch firmware is version 5.0.3. So, the touch is really a K5. Around here, we usually call it a Touch or a KT. The K4 was usually called a K4NT in the early days to distinguish it from the Touch, but the NT part is just a bad habit left over from confusion about the Touch version number. The "real" names used by amazon are the "Kindle Touch" (K5), "Kindle Mini" (K4), and "Kindle Keyboard" (K3).