TT Support walked me through this today. This is all from memory so forgive me if I forget a step or two (I think I had to restart TT HOME and disconnect the device more often than indicated in my instructions) -- that's why step 1 is critical
1. CRITICAL: Make a backup of everything using Windows Explorer before trying this.
2. Delete the application. *DO NOT* let TomTom HOME copy the application to your hard drive.
2.5: Exit from TT HOME.
3. Delete My Documents\TomTom\HOME\FromDevice and My Documents\TomTom\HOME\Download (I'm told these are backups of what is on your device, and since we want TT HOME to re-download the firmware, this will prevent it from restoring a faulty/unwanted backup).
4. From the Device menu inside TT HOME, click Disconnect Device. DO NOT remove the cable! Ignore all prompts from TT HOME, we're not doing what it thinks we're doing.
5. While the device is rebooting, close TT HOME.
6. When the familiar yellow screen is back, start TT HOME again. Let it update your device; it should want to install firmware 7.481. I don't know why, but it does.
7. After installing the new firmware, click Device, Disconnect Device again. Let your TT reboot.
At this point, if you want to continue using 7.481 you can. If you want to run the Update cycle again it will try to install version 8.300.
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