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Downgrade Ilo 4 Firmware Better Access

Why “Downgrade iLO 4 Firmware” Might Be the Best Fix You’ve Never Tried

If you manage an HP ProLiant Gen8 or Gen9 server, you have likely uttered a specific string of curse words followed by a desperate Google search: “How to downgrade iLO 4 firmware.”

Conventional wisdom says newer firmware is always better. It patches security holes, fixes bugs, and adds features. But for HP’s Integrated Lights-Out 4 (iLO 4) management controller, that wisdom is dangerously wrong.

In fact, for many administrators, downgrading iLO 4 to version 2.70 or 2.82 isn’t a last resort—it is the optimal configuration.

This article explains why rolling back your iLO 4 firmware often results in better stability, better performance, and better compatibility than running the latest (and final) versions. downgrade ilo 4 firmware better

The "Better" Downgrade Target

If you decide that downgrading is the better path, the community consensus points to iLO 4 firmware version 2.55 (or 2.54).

Why 2.55?

5.1 Prerequisites

Step 3 – Alternative: HPONCFG for Windows/Linux

If SSH is not available (disabled), use HPONCFG from a networked machine. Why “Downgrade iLO 4 Firmware” Might Be the

  1. Download HPONCFG from HPE.
  2. Create an XML script named downgrade.xml:
<RIBCL VERSION="2.0">
    <LOGIN USER_LOGIN="Administrator" PASSWORD="yourpassword">
        <SERVER_INFO MODE="write">
            <FORCE_DOWNGRADE VALUE="Yes"/>
            <FIRMWARE_UPDATE MODE="write">
                <IMAGE_URL VALUE="http://192.168.1.100/ilo4_265.bin"/>
            </FIRMWARE_UPDATE>
        </SERVER_INFO>
    </LOGIN>
</RIBCL>
  1. Run:
hponcfg -f downgrade.xml

This performs a clean, scripted downgrade while keeping the configuration.

7. Conclusion

Downgrading iLO 4 firmware is a viable strategy to resolve specific operational instabilities or feature requirements. The recommended approach is to target version 2.73 as the optimal balance of stability and security. System administrators must strictly adhere to the backup protocols outlined in this report to prevent loss of management access.

Action Item: Ensure all downgraded iLO interfaces are placed on isolated management VLANs to mitigate the security risks associated with older firmware code. It is the last version before the major HTML5 rewrite

Part 6: Troubleshooting Common Downgrade Failures

Even with the “better” method, things can go wrong.

Part 3: The “Better” Downgrade Method – Step by Step

This method works for all ProLiant Gen8 and Gen9 servers with iLO 4, regardless of current firmware version.

6. Troubleshooting Common Issues

| Issue | Cause | Resolution | | :--- | :--- | :--- | | "Firmware image not valid" | Integrity check failure or incompatible file. | Re-download the file; verify the MD5 checksum. Ensure the file is intended for iLO 4, not iLO 5. | | iLO Not Responding after Flash | Network config reset or flash failure. | Connect to the server physically. Use the F8 utility during POST to reconfigure the static IP. Alternatively, use the iLO port USB override feature if available. | | Lost Advanced License | License cleared during rollback. | Navigate to Administration > Licensing and re-enter the license key. | | Rollback Protected | Some firmware versions prevent downgrading specific components. | Use the -f (force) flag if using the command-line utility, or select the "Allow Downgrade" option in the ROM Based Setup Utility (F8). |