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If your TomTom shows a red cross, it means the device is not able to load the software to be able to operate. Some devices have this software on a SD-card, some have it stored on an internal memory.
If there was a SD-card in your TomTom, I would suggest to put it back. If there is a empty SD-slot on your device, it could be you lost your SD-card, but some TomTom devices have an internal memory AND a SD-slot for memory extension, so if you have an empty cardslot it doesn't necessarily mean there has to be a card in it.
When you never saw a SD-card, probably some data went corrupt on the internal memory. When you have a SD-card, probably some data got corrupted on the SD-card.
To repair the software, you need to connect your GPS to your PC or Mac with a USB cable.
You also need the program TomTom HOME. You can download it for free on the TomTom website.
With TomTom HOME you can update the operating system of your device for free (map updates are nor free).
I had this issue with my Go930 and solved it for Tomtom!! Firstly, you need to ensure that you have the most up to date version of Tomtom Home, from here (http://www.tomtom.com/services) and then before you dock your 720, put an SD card in. It doesnt have to have anything on it and you should only only have to do this the first time. Tomtom home will then ask you which device you wish to update, internal HDD or external. Choose the internal HDD and you are sorted
I had the same problem before on a TomTom GO 730. The free internal memory was too small to hold the updated map so installation failed (the download to PC was OK, the message is misleading). It's a TomTom software bug to not check on the available free memory properly before the update process is started. My TomTom device required a new software install from scratch. Remove any excess MP3 or unused voices before you retry the update.
I would suggest you to look into Underground GPS forum. It has some good info. TomTom official site is not the only way to get and update maps on AVN2210P. Currently I am using version 840 latest USA and Canada map with Navcore 7.833 with no issue. Good luck.
No Maps Found usually means the Application on your internal memory is not the latest one, or the map did not download correctly. Make sure when you select internal memory when updating your device on home, that you update the application as well. V8351 should be the latest application for your device.
Go to My Computer, then the TomTom drive and click explore. Move your Map folder to the desktop. Then, delete everything on the tomtom drive. Unplug it, plug it back in, and start up Tomtom HOME and install all updates, keep unplugging, plugging back in, and installing updates until there aren't any more updates. Then move your map folder back to where it was on your TomTom drive.
I don't know if this will help any, but when I updated my recently purchased tomtom go 720 with the newest app (8.3) and the new voices, map, etc...the voice feature completely stopped working on my unit. Everything else was working fine except the voice. However, I had installed an 8 gig sd card into my tomtom and put all the updates on the sd card because I was running low on the internal memory. Bythe way, only the voice instructions were not working..it would still play mp3's through the internal speaker, so I knew it must be a software problem. After several days with no voice instructions, I then proceeded to re-format the sd card and start all over, as the problem appeared to be a software issue. After re-formatting the sd card, I removed it and installed the back-up file from my tomtom before I did the first update. This time, I deleted a couple of the voices in the update package, so that I would have enough room to install the updates to the internal memory. "Bam" now everything is working perfectly again. I believe for me...the tomtom was having trouble communicating with the new application that I had previously installed on the sd card. I hope this may help someone.