Does the Update Your Kindle button remain grayed out?
Possibly the Duokan people have been caught by the same bug as some of the packages here, where the legacy update creator (before Kindletool came on the scene) does not target a high-enough revision.
Check the update using `kindletool convert -i update_*.bin` and inspect the Target OTA value.
reference:
https://www.mobileread.com/forums/sho...postcount=3536