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Sounds like you tried to upgrade and something went wrong.
If there is a reset button on the bottom or back that'll be your best bet. The red X means it cannot find the operating system but usually a hard reset will fix it.
This is TomToms fix, apparently something went wrong with the software, my advice would be to make a back up of the device using the TomTom home software. This issue can come from disconnecting the device while it is attached to the computer and software while it is busy, always make sure you use the eject device in the TomTom home software if you are connected to the PC.
Make a full backup onto your computer making sure all files are shown. Do not use tt home. Make sure you have a copy of your map in your backup. Do not format. Delete everything on your tt. Connect to tt home and tt home will reinstall the navcore for your device. Copy and paste your map from your backup onto your tt. You should be set to go. A reminder you will lose all your preferances and favorites when you do this.
Tomtom GO 910 GPS Receiverflashing white X in a red circle I discovered that there was a file on the 910 called CLMDATA which was corrupt. When I deleted this in Windows explorer, the unit started up and worked OK. This file is recreated when the unit starts up