Kindle KFX DRM Remove Failed and Solution

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As the Amazon wants to build its own digital ecosystem, employing Kindle KFX DRM to all books becomes a trend. Since more and more Kindle eBooks have been encrypted by Kindle KFX DRM, Epubor Ultimate has been released as the first tool on the market to remove Kindle KFX DRM. Few users may come across the "Kindle KFX DRM Remove failed" issue when using Epubor Ultimate. If you are failed to remove Kindle KFX DRM, you must be very disappointed in Epubor Ultimate or you may even uninstall this software to express your discontent. We can not blame our customers for uninstalling Epubor Ultimate, but we do try our best to figure out what causes the failure. After testing Epubor software and analyzing the bug reports from our users, one thing is entirely clear is that the "Kindle KFX DRM remove failed" issue is mainly caused by mal-operation. In this article, I will list the reasons may cause the Kindle DRM removing failure and how to fix it.

Reasons and Solutions for Kindle KFX DRM Removing Failure

1, You are not using the latest version of Epubor Ultimate.

Please ensure you are using the latest version of Epubor Ultimate because Epubor team regularly update the Epubor Ultimate to crack the latest DRM scheme. What's more, it is free to update Epubor software. Why not update it to the latest version? You must be curious if you are using the latest version of Epubor Ultimate. Please run Epubor Ultimate, then click on gear icon at the top right corner and then you will go to the settings interface. Click on "Help", then click "check up" , and you will see there is an "update" button. If it is in gray color, it means the software is the latest version. Otherwise, you will need to click on "update" button to update it to the latest version.

update epubor ultimate

Or you can download the latest version of Epubor Ultimate here:


2, The Kindle books are not purchased via your own Kindle account.

The eBooks you want to remove the DRM should be purchased via your own Amazon Account. In other words, you should be the owner of this book.

What Kind of Kindle books are not supported by Epubor Ultimate?

Sample books--The books are titled like XXXEBSP.KFX or XXXEBSP.AZW are not supported. Epubor Ultimate are not promise to support sample books, but can handle some of them.

Rented books--If you rent this book, you may fail to remove the DRM from this Kind of eBooks.

Books get from Kindle Unlimited subscription--Many users have purchased the Kindle unlimited subscription service. Of course you can download many book freely, but do not try to use Epubor Ultimate to remove DRM from this kind of ebooks. You are not the owner of these books, but just can read them in the subscription time. It is another kind of rented books.

Bonus Tip:
If you really want to remove DRM from Kindle unlimited subscribed books, you can try to downgrade your Kindle for PC/Mac to the Version1.17 or even older version to download the Kindle books. Then run Epubor Ultimate to remove DRM. Here is the detailed instructions to degrade Kindle app to old version for removing DRM.

Books received from others--Every now and then, you may received some books from others. When you try to decrypt this kind of Kindle eBooks, you will face "Kindle DRM Remove failed" issue. That's because you can not generate the Epubor key file to decrypt these books without your friend account information.

Bonus Tip:
If you really want to decrypt this kind of Kindle kfx eBooks, please register your friends's Kindle account at your Kindle for PC/MAC on your computer and then download the book you want to decrypt. Then run Epubor Ultimate to remove the DRM. Please remember you have to keep the Kindle for PC/MAC in registration mode with your friend's account information until these books have been decrypted.

3, You may not register your Kindle for PC/MAC at your computer.

Some users may deregister their Kindle for PC/Mac after downloading the books. In this situaion, you will be failed to remove Kindle DRM.

Please ensure your Kindle for PC/MAC are registered even if you have finished the downloading. If you really want to de-register your Kindle for PC/MAC on your computer, you can do it after the DRM has been removed from your Kindle books.
Frequently Asked Questions
Q: Can I remove Kindle kfx DRM from Kindle devices?

Epubor Ultimate can handle books downloaded via Kindle device, not including Kindle Fire Tablet, but only Kindle e-ink devices. In this situation, you only have to plug your Kindle device to your computer. Then the Epubor Ultimate will detect the Kindle Serial Number and use it to generate key to decrypt your Kindle books. For details, please read Removing DRM from Kindle KFX eBooks downloaded via Kindle e-Ink devices.

4, You move your Kindle eBooks to other folder without the full content.

Some people like moving their books to the desktop for removing the DRM. This step is really unnecessary as Epubor Ultimate can dectect your default "My Kindle Content" folder and display the books at the left column. The big difference between Kindle old format and the Kindle KFX format is the Kindle KFX format is consisted of a series of files and stored in one folder. So if you want to remove DRM from Kindle KFX ebooks on your desktop or other folders, please ensure you have the whole Kindle KFX eBook folder, not only a file with the extension of azw or kfx.

If the above 4 situations are not applied to you, you can also try the below method to solve your "Kindle KFX DRM Remove failed" issue.

5, The failure may be cuased by computer environment.

We know everyone's computer system environment is different and some special computer enviroment will also cause the failure of removing Kindle KFX DRM. Although this possibility is quite slow, we still provide the solution to this situation.

1 Solutions for Windows system

Step 1: Clear the cache of Epubor Ultimate. Please delete the .ultimate folder. You can find it here: C:\Users\username\AppData\Roaming\.Ultimate.

Step 2: Please delete Epubor_keys folder. You can find it here: C:\Users\username\.Epubor_Keys.

Step 3: Then run Epubor Ultimate to remove the DRM. If you are failed again, please delete the failed books and redownload them again. Run Epubor software to remove the DRM.

1 Solutions for Mac system

If you are using the Mac, there will be a slight different from Windows.

Step 1. Clear the cache of the Epubor Ultimate

Copy and paste this command to your terminal rm -rf ~/.Ultimate and then press on enter. If you are using other Epubor software, please change .Ultimate to .alldrmremoval or.kindledrmremoval.

Step 2. Delete all content Kindle content folder

Open terminal, and then copy this command rm -rf ~/Library/Application\ Support/Kindle/storage to the terminal and then press on “enter" to delete all files in Kindle content folder.

Open the terminal and copy the following command to the terminal rm -rf ~/Library/Containers/com.amazon.Kindle/Data/Library/Application\ Support/Kindle/storage and then press on “enter”.

Then copy this command rm -rf ~/Library/Application\ Support/Kindle and press on “enter” again.

If you have changed the directory of Kindle content folder, you have to find the folder and delete all the files manually.

Step 3. Please also delete the Epubor Key file at your Mac. You can find it here: You can find the Epubor Key files here: Mac: /Users/system user/.Epubor_Keys/

Step 4. Redownload the books and run Epubor software to remove the DRM

Now you only have to re-sync your Kindle books and run Epubor Ultimate to remove the DRM.

Ultimate way to remove Kindle KFX DRM

If above solutions can not fix your problem, why no download the Kindle books directly from the Amazon website as AZW3 format and remove the DRM. An article on our website has given you detailed guide about downloading Kindle eBooks from Amazon website directly and removing Kindle AZW3 DRM--How to Remove DRM from AZW3 eBook Files. I am sure you will get your problem fixed by this method.

Go to Epubor Customer Service Support Center

Epubor team offers various access to Epubor customer service for helping our customer fix their issues and inquiries. If the all above mentioned solutions can not fix your issues, please feel free to contact Epubor Customer Service Center via following methods: starting a livechat, open a ticket, email to us, or chat on skype: epubor.iris@outlook.com to get the instant answer. Epubor team will try our best to figure out what causes the failure of removing Kindle KFX DRM and help you fix it as soon as possible.

Failed to remove Kindle KFX DRM Downloaded via Kinde for PC VERSION1.25

Recently, Amazon is trying to test its new Kindle for PC (version 1.25 ) by automatically recommending user updating software internally. So if you guys has updated your Kindle for PC to version 1.25, you will fail to remove Kindle DRM no matter with Epubor software or Calibre. For now, Epubor team is working on this issue and hope can figure out a solution before Amazon officially releases this new version. Anyway, here is the alternative way to remove the DRM that is uninstalling the Kindle for PC version1.25 and redownloading the version 1.24. Please download the Kindle for PC version 1.24 here and then redownload Kindle books and run Epubor software to remove the DRM. All done, Kindle DRM can be removed like a charm.


joined Epubor since 2017. She always wants to share everything related to ebook reading and improve your reading journey.

08/6/2017 13:49:15
Never going to happen! I will never follow such a ridiculously inconvenient procedure simply to make your program function.  A MUCH better solution is for Epubor to FIX YOUR SOFTWARE so that it works without my having to downgrade my Kindle app, erase 600+ books, reinstall Kindle software, load each of those 600+ books again, then run your program.  If you think that's going to happen you're smoking some really funny mushrooms!
08/9/2017 09:23:18
You are welcome. We are glad to know it works for you!
11/29/2017 14:12:51
...What he said. I'm not going to downgrade and remove all my purchased books just so your softtware will work. I will wait until either a solution is found - or, that Amazon has finally found a way to encrypt content that is unbreakable, and we're all screwed.
12/11/2017 15:09:45
If you like, please contact our customer service about your problem. We can connect your computer to solve your problem directly via TEAM VIEWER
01/13/2018 13:29:07

I downgraded Kindle to the older version but still could convert 3 of the Kindle books to PDF.  Help, please.

I sent diagnostic from cao.tuyet.van@gmail.com with the error messages earlier.


01/15/2018 11:50:29
Thank you for contacting us. One of my colleague has received your email and will guide you to solve  the problem.
04/8/2018 02:19:16

I am a Macbook user. Though your app is quite convenient for me, it can only convert half of the book or less.

I copy the kfx file from my kindle and try to convert it into pdf....but I can only convert half of the book

04/9/2018 10:28:38

Are you using the trial version of Epubor software? The trial version only can save 20% content of each book. If you want to convert the whole book, please purchase the licensed version.
If you are using the licensed version, please contact our customer service support@epubor.com to about your issue. Our technique staff will help you fix this issue.

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