I downgraded to 4.23, re-installed the plugin and found it functional once again. Upon upgrading to 5.01 DeDRM stopped working for me.
![kindle drm removal no key found kindle drm removal no key found](https://www.thebookladysblog.com/wp-content/uploads/2021/03/Remove-DRM-from-Kindle-Books.jpg)
(also to hear your suggestions about solving it for Calibre 5 I'll leave the post up for those who might run into future problem.
#Kindle drm removal no key found serial number#
Do you have the serial number entered for your E-ink Kindle DeDRM not working for kindle in calibre Windows 10 DeDRM v6.5.5: Ultimately failed to decrypt after 0.3 seconds DRM removal happens when you first add the book to calibre, not during conversion. DeDRM v6.5.5: Looking for new default Kindle Key after 0.3 seconds searching for kinfoFiles in C:\Users\FMW\AppData\Local No K4PC /kinf/kinf2011 files have been found.
![kindle drm removal no key found kindle drm removal no key found](https://www.osxwiki.com/wp-content/uploads/2020/09/calibre-drm-removal-5.jpg)
DeDRM v6.5.5: Failed to decrypt with error: No key found in 4 keys tried.