Toshiba e-STUDIO477S Service Manual page 459

If the PU board setting value cannot be downloaded properly, the following error message is displayed.
Click [OK] in the error message window to display the following message.
Click the [Finish] button on the "PU board replacement - Download" screen to disconnect the printer
connected and return to "PU board replacement - Menu" screen.
When the PU board setting value cannot be downloaded
The saved PU board setting value of a device is maintained when the validation check results in an error, or
until the [Finish] button is clicked on following the successful completion of downloading.
Therefore, even if the download operation fails, the device's PU board setting value is not lost.
The procedures for replacing the PU board are described in
Failed to download the PU board setting value.
Check the printer, then, try downloading again.
If you click [Finish], the printer is disconnected, and you will
return to the "PU board replacement - Menu".
Appendixes
Maintenance Utility Operating Manual 42678819FU02 - 23/38
D.