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chicagotech
Beginner

Can't upgrade boot version on SG300 with error illegal software format

We have one Cisco SG300 swicth with firware 1.2.7.76 and boot version 1.1.0.6. We try to upgarde the boot version from 1.1.0.6 to 1.3.7.18.  But We get Copy: illegal software format. What could be the problem?

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