I recently did the jailbrake following this guide :
https://kindlemodding.org/jailbreaking/WinterBreak/ and did it until the end successfully, but
once i installed this packet (by adding the koreader folder dir in the root directory in kindle and added the extension content to the extension folder):
koreader-kindlehf-v2024.11-223-g154ec621d_2025-03-03.zip
the KOreader options appeared in the kindle but when i tap "Start KOReader" nothing happens.
Can someone help?