I made the mistake and updated a working TS501. The Nissan Titan (315MHz) and Scion FR-s (315MHz) settings worked great. I registered it and did the update and now the Titan setting is for 433MHz and the FR-S disappeared from the list. I reformatted the card and did a clean update and it didn't help at all.

It is like I now have the European files instead of USA. How do I fix this?

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 I guess there is a glitch in the software. The market was set to America and the language was English and it seemed to have only European models. I switched to Europe and Deutsch and then back to English and America and my vehicles are now correct. Evidently during an update it defaults to Europe even though it still shows America being checked. Wasted a day researching and trying to figure it out. Hopefully this will help someone.