This article explains how to upgrade the firmware on the Dell EMC X-series switch
Step 1: Copy the firmware file (.ros) and boot code file (.rfb) to the USB
Step: 2 : Log in to the switch web interface Switch management -> File update and backup . Select option USB. The .ros file must be updated by selecting software image.
Step 3: Update the .rfb file by selecting the boot code option for boot code update.
Step 4: Select the version of the firmware to be upgraded after switch reload. Active firmware image->Apply version after reboot
Step 5: Save the configuration before reload. Reload the switch by using the option "reboot" on the setting option available on top right.