How to register a Kindle DX in 2018

I recently repaired a Kindle DX for a friend. As part of that, I reset it to factory defaults. When I went to register it so it would connect to his Amazon Account, I received the following error:

Your Kindle is unable to connect at this time. Please try again later. If the problem persists, please restart your Kindle from the menu in Settings and try again.

I confirmed the Kindle was running the latest software. Some chatter on the Internet suggested Amazon had disabled (re)registration for older Kindles, but that turned out to be a bug that Amazon had already fixed.

Restarting didn’t fix the problem. Turning wireless on and off didn’t fix the problem. Downloading a free book didn’t fix the problem. Wireless was definitely working — I could browse the Kindle store.

I called Amazon support. They suggested changing the password. That didn’t work. The rep tried deregistering the Kindle and then manually re-adding it to my friend’s account. That didn’t work.

He promised a callback three days later (today). The callback never came.

I called Amazon support again. I explained the situation and asked for an update. The support representatives were anti-helpful. They suggested a factory reset (that’s what got me in to this situation in the first place). I asked for a manager. Twice. Neither supervisor was helpful. One offered me 15% off a new Kindle, which I did not want. The reps would not divulge a case number or ticket number. I eventually was told by “Dorothy” that “Murray” was the person I spoke to on Sunday and he’d call me back.

During the 45-minute call, I did some additional research. It turns out that in addition to updating the Kindle to 2.5.8, you need to install the Kindle Services Update. (See Kindle DX Software Updates.) You can do so via USB from your Mac or PC. (See Transfer & Install Software Updates Manually.)

  1. Download the Kindle Services Update
  2. Copy the update-caupdate-05.bin to the root level of your Kindle
  3. Disconnect your Mac from the Kindle
  4. From Home, press the Menu button, and then select Settings.
  5. Press the Menu button, and then select Update Your Kindle.
  6. Select OK.
  7. Wait for your Kindle to update and restart.

Assuming it’s listed in your Amazon account, your Kindle will automatically reregister itself. If not, register the device manually.

So what is this additional update? A new set of security certificates.


  • The Kindle gives a generic “unable to connect” error. Nothing about the error message indicates it was problem with certificates. The corrective action it suggested (wait, restart) will fail 100% of the time.
  • Instead of releasing a 2.5.9 update, Amazon released this as a supplemental update. This makes it hard for users to know if the update is installed.
  • Amazon support staff are exceptionally poorly trained and didn’t think to check if I had installed the CA Update.

8 Responses to How to register a Kindle DX in 2018

  1. Scott H says:

    Having two-factor authentication can also cause problems, and apparently the old DX code, even with the latest updates, doesn’t display a warning – registration just fails. Even disabling two-factor may not be successful – but there is a fix.

    I was traveling in Mexico and trying to register a DX. After trying everything I could think of, including updating firmware and turning off two-factor, I still couldn’t get the device to register. So I went out to the Amazon Device Forums (on my computer) and was going to post a question there. Since I hadn’t logged in there before, and even with two-factor off, Amazon insisted on sending an authentication code to my phone because I was logging in from a new location. After I did that, I thought that Amazon might now accept my DX connecting from Mexico, and sure enough, it did.

    When I went back to re-enable two-factor, only then did Amazon point out another work around: you can append the two-factor code from an authentication app to the password on a device like a Kindle, as described here:

    I was surprised that no one had run into this and posted a solution before. Hopefully this will help someone else.

  2. Julia Hess says:

    Really, I tried after updating and disabling two step and still didn’t work. So I used Scott’s tip and just added the code generated the app at the end of my password in DX refistration screen and it finally worked! Thanks a lot!

  3. Jared Knipp says:

    I tried tip of appending the two factor auth code from my app to my password and it worked to my surprise. Re-registration worked.

  4. Ron says:

    This solved my issue. Thanks!

  5. Thanks for this… it lead me down the right path!
    Note, there are different updates for different Kindle DXs… make sure you get the correct one.

  6. Toni Dallo says:

    Thank you so much Paul Schreiber!!! It worked for me! It has been years that I was Looking for a solution!
    As Craig Wiseman told pay attention that there are different update files. After registering I had to “refresh” the device
    (Note: I am in Switzerland and have no two-factor autherntification)

  7. Man, I appreciate this! Your experience mirrored mine exactly with Amazon. I was on the verge of taking that 25% off trade in on a new Kindle, even though I really didn’t want to. I love the bigger screen of my DX and the buttons and the keyboard. I hate the idea of having to swipe to change pages.

    I will add to this though that the update didn’t take the first few times I tried it. I kept getting an error message saying “Update unsuccessful,” and then it would reset and the file for the update would no longer be in my Kindle when I looked at it on my Mac. Like, it would disappear.

    It finally worked after what felt like a dozen times, and then I was able to register it. I don’t know if it was just repetition, but the final time I tried it, I had to “open” the file within the kindle, and then re-add the unopened update into the Kindle, so that when I ejected it, I had both the opened and unopened version of the file in there. Then the update was successful.

    Really happy I could get this Kindle working again! Thanks for your help!

  8. Philip Davids says:

    Hadn’t used my Kindle in a long time, thought my DX was effectively bricked, had wireless but couldn’t connect, couldn’t update with the 20Mb update file – dropped the ” update-caupdate-05.bin” file in the directory, my Kindle updated and everything seems to be back to normal. Thanks.

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