X710 firmware downgrade fail from 17.5.10 to 16.5.20. How to resolve?

Hi Experts,

I have tried to downgrade the X710 firmware on R630 server from 17.5.10 to 16.5.20

Please find below nic details and logs,

dmidecode | grep -A4 "System Info"
System Information
        Manufacturer: Dell Inc.
        Product Name: PowerEdge R630
        Version: Not Specified
        Serial Number: <To protect you, your private information was removed from public view. All private data was saved to your private Case. DELL-Admin>

ethtool -i eth10
driver: i40e
version: 2.22.18
firmware-version: 5.04 0x800024c9 17.5.10
expansion-rom-version:
bus-info: 0000:81:00.0
supports-statistics: yes
supports-test: yes
supports-eeprom-access: yes
supports-register-dump: yes
supports-priv-flags: yes

./Network_Firmware_KWCDH_LN_16.5.20_A00.BIN
Collecting inventory...
../shellfit.sh: line 3:  6119 Segmentation fault      (core dumped) ./nvmupdate64e -s -oem d $1 $2 $3
.
Inventory collection failed.

dmesg -T | grep -i i40e
[Tue Dec 16 14:47:39 2025] i40e: loading out-of-tree module taints kernel.
[Tue Dec 16 14:47:39 2025] i40e: module verification failed: signature and/or required key missing - tainting kernel
[Tue Dec 16 14:47:39 2025] i40e: externally supported module, setting X kernel taint flag.
[Tue Dec 16 14:47:39 2025] i40e: Intel(R) 40-10 Gigabit Ethernet Connection Network Driver - version 2.22.18
[Tue Dec 16 14:47:39 2025] i40e: Copyright(c) 2013 - 2023 Intel Corporation.
[Tue Dec 16 14:47:39 2025] i40e 0000:81:00.0: fw 5.0.40043 api 1.5 nvm 5.04 0x800024c9 17.5.10
[Tue Dec 16 14:47:39 2025] i40e 0000:81:00.0: MAC address: 3c:fd:fe:22:23:c0
[Tue Dec 16 14:47:39 2025] i40e 0000:81:00.0: FW LLDP is enabled
[Tue Dec 16 14:47:39 2025] i40e 0000:81:00.0: PCI-Express: Speed 8.0GT/s Width x8
[Tue Dec 16 14:47:39 2025] i40e 0000:81:00.0: Features: PF-id[0] VFs: 64 VSIs: 66 QP: 24 RSS FD_ATR FD_SB NTUPLE CloudF DCB VxLAN Geneve NVGRE PTP VEPA
[Tue Dec 16 14:47:39 2025] i40e 0000:81:00.1: fw 5.0.40043 api 1.5 nvm 5.04 0x800024c9 17.5.10
[Tue Dec 16 14:47:39 2025] i40e 0000:81:00.1: MAC address: 3c:fd:fe:22:23:c2
[Tue Dec 16 14:47:39 2025] i40e 0000:81:00.1: FW LLDP is enabled
[Tue Dec 16 14:47:39 2025] i40e 0000:81:00.1: PCI-Express: Speed 8.0GT/s Width x8
[Tue Dec 16 14:47:39 2025] i40e 0000:81:00.1: Features: PF-id[1] VFs: 64 VSIs: 66 QP: 24 RSS FD_ATR FD_SB NTUPLE CloudF DCB VxLAN Geneve NVGRE PTP VEPA
[Tue Dec 16 14:47:39 2025] i40e 0000:81:00.0 eth10: renamed from eth0
[Tue Dec 16 14:47:40 2025] i40e 0000:81:00.1 eth11: renamed from eth2
[Wed Dec 17 10:17:39 2025] i40e 0000:81:00.0 eth10: Module EEPROM memory read not supported. Please update the NVM image.
[Wed Dec 17 10:17:39 2025] i40e 0000:81:00.1 eth11: Module EEPROM memory read not supported. Please update the NVM image.
[Thu Dec 18 06:20:02 2025] i40e 0000:81:00.0 eth10: Module EEPROM memory read not supported. Please update the NVM image.
[Thu Dec 18 06:20:02 2025] i40e 0000:81:00.1 eth11: Module EEPROM memory read not supported. Please update the NVM image.
[Thu Dec 18 07:43:58 2025] i40e 0000:81:00.0 eth10: Module EEPROM memory read not supported. Please update the NVM image.
[Thu Dec 18 07:43:58 2025] i40e 0000:81:00.1 eth11: Module EEPROM memory read not supported. Please update the NVM image.


Is downgrade from 17.5.10 to 16.5.20 supported on X710 Nic?

Please le me know other possible ways to do.

Regards,
Sneha