Texas Instruments TI89TITANIUM User Manual - Page 735
If You are Upgrading the Operating System on Multiple Units, Error Messages
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Page 735 highlights
If You are Upgrading the Operating System on Multiple Units To perform an OS upgrade on multiple units, download and install the OS into one unit and then transfer the OS upgrade from one unit to another. This method is faster than installing it on each unit via a computer. OS upgrades are released free of charge and you do not need to obtain a certificate before you download or install them. Error Messages Most error messages are displayed on the sending unit. Depending on when the error occurs during the transfer process, you may see an error message on the receiving unit. Error Message Description The sending and receiving units are not connected properly, or the receiving unit is not set up to receive. The certificate on the receiving unit is not valid for the operating system (OS) or App on the sending unit. You must obtain and install a valid certificate. If the App no longer requires a certificate, you can download it again from the Texas Instruments Web site at education.ti.com and then install the App again on your calculator. An error occurred during the transfer. The current OS in the receiving unit is corrupted. You must reinstall the product software from a computer. Connectivity 735