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My radio is in a rebooting loop

I have a Kenwood DNX 9990HD radio and when i turn it on it just keeps rebooting.

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Have you tried resetting the device?

Here is an image that shows how. (apologies for the poor quality)

Block Image

If that doesn't work try removing all the power from the device , press and hold the on button for 10 seconds to drain residual power, then re apply the power supplies and see if it starts normally.

If the reset or power refresh works you may wish to check that the firmware is up to date.

Here is a link that shows the models that the firmware is for. In it, there is a link to a guide on how to install the firmware (take note of the precautions at the bottom of the guide) as well as a link to download the firmware file.

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I tried to reset it but that didn't work either


Hi, Since you have got nothing to lose, try updating the firmware as per the guide. I know with some TVs that when you power it on the first thing that it does is look at the external USB or MMC port to see if there is a file there with the correct name for a firmware update. Perhaps your radio is the same. Download the firmware file, install it in the root directory of the USB drive (i.e. don't put it in a sub folder on the drive) and then plug the USB into the radio and switch on and see what happens.


I will try that thank you


No luck its still in the rebooting loop, thank you for the help, do you have any other suggestions


Hi, My only suggestion now is to contact Kenwood Home and Car products, (here is a link if you are in the USA of course ) and ask to speak to someone in Technical support regarding whether there is a 'fix' for a bootloop problem in your model device. It never hurts to ask and you may be surprised by the answer. At least you will know.


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I have the same problem with my kenwood ddx9702s. It may reboot 4 times in a row then it might not do it for 2 days. I was hoping to find a way to resolve it other than going to a Kenwood service center. I do not have one close by. I would like to do a factory reset but I cannot figure out how.

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Also I have updated to the lastest firmware.


And of course I have reset the unit many times. It seems to improve the situation for a while but it will eventually start rebooting again.


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Dominick Lanzisera will be eternally grateful.
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