Due to some issues with VMware ESXi 5.5, VMware ESXi 6.0, and VMware ESXi 6.5, you cannot upgrade or downgrade IR/IT firmware through LSA following the usual firmware flashing procedure. You must follow this suggested workaround:
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Edit the /etc/sfcb/sfcb.cfg file.
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Add the httpMaxContentLength: 4194304 parameter.
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Restart the LSA service:
/etc/init.d/sfcbd-watchdog restart
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Flash the firmware.