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How Upgrade firmware SG500-28p

hi , need  Upgrade firmware to Cisco SG500-28P 28-port Gigabit POE Stackable Managed Switch

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to update the boot loader

to update the boot loader before attempting the firmware. Bootloader (file .rfb) can be found in the same folder as the firmware zip please make do some special procedure, such as creating any profile or something to save the before.?

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