makes it so that we retain the old file, e.g. GP2040CE.uf2.old if we're about to write GP2040CE.uf2 Signed-off-by: Brian S. Stephan <bss@incorporeal.org>
makes it so that we retain the old file, e.g. GP2040CE.uf2.old if we're about to write GP2040CE.uf2 Signed-off-by: Brian S. Stephan <bss@incorporeal.org>