Press Install and Reboot to install the firmware update and reboot the system.
The instructions for updating the TX9 playlist are essentially the same for all of the models listed above.
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Copy the contents of the spreadsheet to a new one, and deleted the old one (it wasn't a particularly important spreadsheet, thankfully), and everything was fine.
I can only assume that somehow the file had become corrupted.
But instead of running to the hardware store to buy a set of boring numbers, consider making your own!