Solution 12151: Updating to Operating System (OS) Version 3.10 for the TI-89 Titanium and Voyage™ 200 Deletes All Calculator Software Applications (Apps).
Why did all the apps on my calculator disappear when I updated to OS v3.10 on the TI-89 Titanium or Voyage 200?
The TI-89 Titanium and Voyage 200 OS v3.10 will reset the RAM and Flash ROM memory as part of the updating process. This is done to ensure maximum compatibility with the operating system and apps. It is highly recommended that existing programs and apps are backed up before upgrading to OS v3.10
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