Kenwood DNX7210BT

I have tried to update my DNX7210BT car multimedia (radio, tv, navigation) system fom Kenwood.  I followed all the instructions from Kenwood's website, as the update is done via USB stick.  The updated started as expected, but after 20 minutes reported "Update error, remove USB stick". I complied and the screen now read "Updating software, insert USB stick", and this continued a couple of times, before I gave up.  The device does not work anymore, whenever I turn it on I get the message "Updating software, insert USB stick", and I just can't get it out of this mode.
My question is, does anybody know how to reset this device, to some sort of known state, from where I can perform a controlled repair action, and how to get it back to working condition?
I have tried via the Kenwood website, via the distributor who sold me the device, and I don't seem to get any usable answers.
I know I can drive my car to the dealer, and just ask him to fix it, but how long will that take, and I will be without a car for an unknown period of time.
ThomasFjordAsked:
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Zephyr ICTCloud ArchitectCommented:
According to the documentation the reset button should be the upside down triangle (Kenwood sign) ... You've probably tried that one already?
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ThomasFjordAuthor Commented:
Yes, I have tried that.  I also completely removed power to the unit, but it still returns to the "Updating software" state.
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Zephyr ICTCloud ArchitectCommented:
Hmmm ... That's not good, that one should do a factory reset, if that doesn't work, did you try keeping the reset button pressed when inserting power? Worth a try maybe.

If it's a problem with a corrupt image on the internal memory then it might need to go back to the supplier.

Normally you could just send the unit, at least you can here ... No need to be without a car.
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Michael-BestCommented:
"I know I can drive my car to the dealer, and just ask him to fix it, but how long will that take, and I will be without a car for an unknown period of time."

Probably the easiest and fastest solution.

Call your dealer to confirm their estimated service time.

It should only take the dealer less than 20 minutes to reset the unit.

If it needs to be removed ( taking up to 2 hrs depending on your car ) and then sent to be factory serviced, you will not be without your car during the service period.
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BillDLCommented:
I found what I believe may be a relevant (although logical and pretty obvious) warning on page 50 of the user manual:
http://images.kenwood.eu/files/prod/2365/5/DNX7210BT_DNX5210BT_5510BT_4210BT(EN).pdf

NOTE
• Disconnect the USB device before pressing the <Reset> button. Pressing the <Reset> button with the USB device connected can damage the data stored in the USB device. For how to disconnect the USB device, see How To Play Media (P.13).
• When the unit is turned on after resetting, the Initial SETUP screen appears. See Initial setup (P.11).
Assuming there was a glitch during the firmware update and the USB stick was left connected or removed in a way that could have messed up the data on the stick, you would not be able to use that same update data on the USB stick to try and run the update again even if you could get the device to boot to a usable menu.

I suppose you could try downloading the last update again, copy it to the USB stick to overwrite the data already on it, then try to start up the device with the USB stick already connected to see what happens.

Download page:
http://www.kenwood.com/cs/ce/mm/firmware/2012/2012b/eng.html

Update (132MB):
http://www.kenwood.com/cs/ce/mm/firmware/2012/2012b/software/DNX_Ver1.11.0.zip

Instructions:
http://www.kenwood.com/cs/ce/mm/firmware/2012/2012b/pdf/1306_DNXmid_FWupdate_en.pdf

Although the Kenwood site detected that I was in the UK and loaded the .co.uk site, the download page I was sent to seems to be the "Global" one.  If in any doubt, go through the Kenwood site that loads for you and see if it ends up on the same landing page.

Personally I think you will have to look around salvage yards for the same model, because it could cost you as much for your dealership to try and restore it ..... unless of course you don't let on that you tried to update it and just said that it packed in and ask if it is covered by warranty.
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ThomasFjordAuthor Commented:
Thanks guys.
I did return the car to the dealer, and he removed the unit and did something from the back of the device and then installed the update via a rear USB plug.
It is now working, but I am not sure I will try to do an update again!
Thanks again all of you.
Best regards, Thomas
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Michael-BestCommented:
Can you select and award points for the most helpful advice... I would suggest points be awarded to:

Michael-BestPosted on 2013-08-31 at 16:55:11ID: 39454622

"Probably the easiest and fastest solution.

Call your dealer to confirm their estimated service time.

It should only take the dealer less than 20 minutes to reset the unit."
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