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Backup the Tomtom to your computer. !!!!!!!!
Format the Tomtom hard disk
Logon to Tomtom home and carry out an update
When it has completely finished updating copy the map directory back onto the root of your Tomtom hard disk.
This action forces the Tomtom home site to completely update the program on your Tomtom to the latest applicable application.
This may involve updating the the bootloader as well as the Navcore software.
The maps will go straight back on ok as they should already have been initialised for that device.
Most new Navcores now incorporate the Quickfix which enables the sattelite signal to lock on quicker.
Regular visits to the Tomtom home website will update the quickfix data which really needs to be done weekly as the data expires.
Pressing the reset button also renders the old Quickfix data useless.
If the above does not work then I suggest that you have a hardware problem which would require a professional repair.
tomtom is coming out with software soon to be able to use your g1 as a gps device. theres apps on the market that let you view traffic updates just look up gps on the apps market and find one there. i believe google maps does traffic updates. you should get the docking station for your car it replaces expensive gps devices.
Hopefully this will fix your tt910, I followed the instructions below and my tt910 is now working fine.
Please download software from attached links and save it on you computer desktop / connect tomtom to computer and close "tomtom home when it starts / select and copy all 5 downloaded files / open "my computer" / right click on drive where tomtom is located and paste / select "yes to all" when windows ask if you want replace existing files ,this will refresh software on your device and maps should work .
TomTom's have definitely improved over the years. I'd say a lot has to do with the better mapping available. Tele Atlas is making great strides and TomTom supplements their data with Map Share and user corrections. I've seen a huge improvement from my ONE to my Go 930. I'd say take advantage of their offer and get something new with the new maps. Electronics only have so long of a shelf life, might as well capitalize while you can since a 5 year old product is well out of warranty
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There a two things you must do.
Update the TT5 software to TT 5.1.
... and then you need to buy the complete maps for TT NAVIGATOR 5. They are priced at 199 Euro but with the voucher you get a 70 Euro discount.
Then it is just installing the new maps and be on your way.