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.
When admins ask for a “better” downgrade, they aren’t talking about security scores. They are talking about actual usability. Here is what you gain by moving back.
Not all older versions are equal. The consensus in the HPE community points to iLO 4 version 2.70 or 2.73 as the "gold standard." These versions offer:
Avoid going too far back (e.g., 1.x or early 2.x releases), as they may lack critical security patches or introduce other known issues.
Modern browsers (Chrome, Firefox, Edge) have become extremely aggressive about HTTPS certificates. Newer iLO 4 firmware tries to enforce modern TLS 1.2 standards. However, because the iLO 4's certificate authority is ancient, this often leads to "ERR_SSL_VERSION_OR_CIPHER_MISMATCH" errors where the browser refuses to connect at all.
Older firmware versions (which use older, less strict TLS 1.0) ironically work better with old browsers or by simply clicking "Proceed to site" in Firefox.
Downgrading iLO 4 firmware isn’t about being a Luddite—it’s about operational pragmatism. HPE has shifted focus to iLO 5 and iLO 6, leaving iLO 4 with half-baked updates that often break more than they fix.
By using the methods described here—SSH force downgrade, HPONCFG scripting, and careful version selection—you can take control of your Gen8/Gen9 servers, reduce noise, restore compatibility, and extend the useful life of your data center hardware.
Remember: Back up your configuration. Choose a proven version. Block future updates. That’s how you downgrade iLO 4 firmware better.
Have a preferred iLO 4 version not listed? Share your experience in the comments below (on the original blog post). For urgent help, visit the HPE Community forums or the /r/homelab subreddit.
The Case for iLO 4 Firmware Downgrade While firmware updates generally improve security and stability, certain versions of HPE Integrated Lights-Out 4 (iLO 4) have introduced specific behaviors—particularly around fan acoustics third-party hardware compatibility —that lead many administrators to consider a downgrade. 🚀 The "Better" Argument: Why Downgrade?
The primary reason users seek older iLO 4 versions (specifically ) is to regain control over server noise. Fan Speed Management downgrade ilo 4 firmware better
: Later versions of iLO 4 (v2.73+) introduced stricter "Segmented Algorithms" for cooling. These algorithms often ramp up fans to 70–100% duty cycle if a non-HPE PCIe card third-party SSD
is detected, as iLO cannot read the thermal data and defaults to a "fail-safe" high-speed mode. Custom Fan Mods : Popular community "silence" patches (like the ilo4_unlock toolkit) often require a base firmware version like
to function correctly. These patches allow users to manually set lower fan speeds via SSH. Legacy OS Stability
: Some older server operating systems or specific drivers for Gen8/Gen9 hardware perform more predictably with versions like
, avoiding "iLO watchdog reset" errors found in some transitional releases. HP Support Community 🛠️ How to Safely Downgrade
Downgrading is possible but requires bypassing certain built-in security checks. 1. Verification of Access iLO License
: A license is typically required to access the "Downgrade Policy" settings in the web interface. Ensure it is set to "Allow downgrades" Administration > Access Settings Firmware Format : You must extract the file from the HPE package. Only the file can be uploaded via the iLO web interface. 2. Standard Downgrade Procedure (Web UI) Does anyone know anything about downgrading ILO 4?
While downgrading iLO 4 firmware is possible, it is rarely "better" for modern environments unless you are troubleshooting a specific regression or compatibility issue Hewlett Packard Enterprise Community Reasons to Downgrade Interface Preference:
Users often prefer the "minimalistic" and "compact" GUI of iLO 4 versions v2.30 or earlier
. Newer versions (v2.40+) adopted a new style with larger fonts and more scrolling. Hardware Compatibility:
Some non-HP components (e.g., third-party GPUs) may trigger "non-genuine part" warnings or fan speed issues on newer firmware, which can sometimes be bypassed by rolling back to an older version. Bug Troubleshooting:
If a specific update introduces stable connection drops or watchdog reset errors, a temporary downgrade may restore stability. Critical Risks & Constraints Downgrading iLO 4 firmware is a viable strategy
To "downgrade iLO 4 firmware better," you generally need to use the iLO web interface or the HPE Service Pack for ProLiant (SPP) in interactive mode to force the installation of an older version.
Users typically seek this "feature" to resolve performance or hardware compatibility issues, such as:
Fan Speed Issues: Newer firmware sometimes causes server fans to run at 100% speed constantly; downgrading can restore normal fan control.
Legacy Hardware Support: Certain older components or "non-genuine" parts (like third-party GPUs for transcoding) may be flagged or restricted by newer iLO 4 security protocols.
Stability: If a recent update causes frequent crashes or GUI lag, returning to a leaner, stable previous version can restore usability. How to Downgrade iLO 4 Firmware
The most direct method is through the iLO web interface using a standard firmware image file.
Updating the BIOS and/or iLO firmware using the iLO web interface
The Ultimate Guide to Downgrading iLO 4 Firmware: Why, How, and Is It Better?
In the world of HPE ProLiant Gen8 and Gen9 server management, "newer" isn't always synonymous with "better." While Hewlett Packard Enterprise (HPE) generally recommends keeping systems updated, a vocal segment of the homelab and enterprise community often seeks to downgrade iLO 4 (Integrated Lights-Out 4) firmware.
Whether you're battling aggressive fan speeds, seeking a specific "unlocked" feature, or finding the modern web interface too sluggish, this guide breaks down the process and the trade-offs. 1. Why Downgrade? The "Better" Argument
While HPE pushes updates for security and stability, many users find specific older versions (or patched versions based on older kernels) superior for these reasons:
Silence of the Fans: One of the most common reasons is to regain control over system fans. Newer iLO 4 versions can be extremely aggressive with fan curves when non-HPE "genuine" parts (like third-party PCIe NVMe drives or GPUs) are installed. When admins ask for a “better” downgrade, they
Unlocked Features: Community-patched versions, such as those based on v2.77, allow users to bypass standard fan restrictions entirely.
Interface Preference: Some administrators find the older, simpler web interface of versions prior to 2.40 more responsive or easier to navigate than the modern HPE-branded "Ugly GUI". 2. Strategic Versions to Consider
If you are moving away from the latest (e.g., v2.82), these are the historical "sweet spots": Key Characteristic v2.82 Latest Security Patches Production environments facing the public internet. v2.77 (Patched) Community "Unlocked" Homelabs requiring custom fan speed control. v2.70 HTML5 Remote Console
Users who want the modern HTML5 console without the very latest overhead. v2.53 or older Pre-Security Hardening
Generally avoided due to critical authentication bypass vulnerabilities. 3. How to Downgrade iLO 4 Firmware
Downgrading is technically supported but may require specific settings to be toggled first. Step 1: Check Downgrade Policy
Before attempting an install, you must ensure iLO allows the rollback: Log in to the iLO 4 Web Interface. Navigate to Administration > Access Settings.
Under the Update Service section, ensure the Downgrade Policy is set to "Allow downgrades".
Warning: If this was ever set to "Permanently disallow downgrades," it cannot be changed, and the hardware is locked to current or newer versions. Step 2: Perform the Flash There are three main ways to apply the older firmware: How to downgrade to an older SPP firmware automatically
The single biggest reason to downgrade iLO 4 is the remote console.
The Verdict: If you need a reliable KVM experience on a local network, the older Java-based firmware is better.