Is there a trick to turn old bread into almost-new bread?
While it is never possible to restore bread to its fresh baked glory, toasting can help.

The main staling mechanism in bread is the re-crystalization of the formerly gelatinized starches, making the bread seem hard and dry.

Toasting heats the bread up, and helps the starches re-gelatinize, and so can help mitigate the staleness, although it is not a complete cure.