Brian S. Stephan 2648aebd4f
add --backup flag to concatenate
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>
2024-04-15 10:13:28 -05:00
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2024-03-08 00:02:43 -06:00
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2024-03-08 00:02:43 -06:00
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