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Hello Igor,
The upgrade path is highlighted in the upgrade guide:
https://www.cisco.com/c/en/us/td/docs/unified_computing/ucs/ucs-manager/GUI-User-Guides/Firmware-Mgmt/3-2/b_UCSM_GUI_Firmware_Management_Guide_3_2/b_UCSM_GUI_Firmware_Management_Gu...