: Verify that your Flash memory has enough room. The 2960-S usually has 64MB or 128MB of flash; use show flash: to check.
Let's break down the filename to understand what it represents: c2960s-universalk9-tar.152-2.e9.tar
Are you upgrading a or a FlexStack cluster ? : Verify that your Flash memory has enough room
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Always backup your running configuration ( copy run start then TFTP/FTP). c2960s-universalk9-tar.152-2.e9.tar