Upgrade Failure

Dell S5296F: How to rollback to the previous image after a failed upgrade

Q: Where can I find the Dell official documentation?

https://www.dell.com/support/kbdoc — search the product family + feature name.

By Sai Kiran Pandrala · reviewed by Sai Kiran Pandrala, Editor Last verified: 2026-05-30

⚡ At a glance

Vendor	Dell
Operating system	Dell OS10 / SmartFabric OS
Category	Upgrade Failure
Skill level	Intermediate to advanced
DIY-able?	Yes with CLI access; some scenarios need Dell ProSupport + RMA.

Upgrade work on a Dell fleet is mostly about discipline. Dell OS10 / SmartFabric OS gives you the commands; the failure mode is almost always operator error. wrong image for the platform, integrity not checked, no rollback plan. The S5296F family is no exception.

I always do a one-box pilot before a fleet roll. image install tftp://10.10.1.100/PKGS_OS10-Enterprise-10.5.6.0.bin on a single representative unit, then 24 hours of soak, then the rest of the fleet in waves. Skipping the soak has bitten me twice.

Dell ProSupport will want the exact build string and the upgrade method (CLI vs controller-driven) on every case, so keep that recorded for the change ticket.

What this guide covers

Real-world context. Last time I walked through this on a real machine, the budget shook out to ~Rs 0 INR under ProSupport, otherwise ~Rs 3,000 to Rs 40,000 INR for parts (around $36 to $480 USD). Plan for ~20 to 60 minutes hands-on actually at the keyboard, and ~1 to 4 hours including SupportAssist scan once you factor in the back-and-forth. Keep the service tag, the SupportAssist export, and a USB recovery stick within arm’s reach before you start, stopping mid-step to hunt for them is how a 30-minute job turns into an afternoon.

Rollback to the previous image after a failed upgrade on a Dell S5296F (Dell OS10 / SmartFabric OS).

Full fix path

Confirm there's a previous image still on flash.
Set the boot variable to that previous image.
Reboot.
Verify the version is back to the prior release.
Investigate the upgrade failure separately: do not re-attempt without root cause.

CLI / commands

# Boot recovery prompt: ONIE:/ #

# Verify image
show version

# Upgrade
image install tftp://10.10.1.100/PKGS_OS10-Enterprise-10.5.6.0.bin

# Save / commit
write memory

# Rollback
image cancel

Recovery options

Boot loader recovery (ONIE:/ #)
Rollback to the previous image with image cancel
Force failover to a known-good standby (HA platforms)

Frequently asked questions

Will this work on my specific Dell OS10 / SmartFabric OS version?

The procedure reflects current Dell OS10 / SmartFabric OS behaviour. Older releases may need minor syntax adjustments, use the CLI help (? or tab-completion) to verify.

Should I open a Dell ProSupport case immediately?

Open one if you suspect hardware failure or the symptom persists after a maintenance-window reload. Make sure your support entitlement is active first.

Where can I find the Dell official documentation?

https://www.dell.com/support/kbdoc. search the product family + feature name.

Is this procedure safe in production?

Test in a lab or maintenance window first. Capture pre-change state so you can roll back.

All Dell fix guides → /dell/
All vendor guides → /vendors/

Related guides worth a look while you sort this one out:

References

Dell support portal: https://www.dell.com/support
Dell knowledge base: https://www.dell.com/support/kbdoc
Dell security advisories: https://www.dell.com/support/security
Open a case: https://www.dell.com/support/incidents-online

Reference material, not professional advice. Validate against your specific Dell OS10 / SmartFabric OS version and test in a non-production environment before applying.

Why this matters for your day-to-day

A Dell device that's misbehaving costs more than the fix itself: lost productivity, missed calls, security risk, even safety risk in some categories. Treating the symptom quickly with a documented procedure is cheaper than letting it persist. The steps above are written to get you back to working in under an hour where possible, and to flag clearly when escalation is the right call.

Safety + preconditions

Before any work on a Dell device:

Unplug from mains for any internal-access procedure.
Discharge stored energy (capacitors in PSUs, residual battery charge) per manufacturer guidance.
Use ESD-safe handling for boards and modules, no carpet, no wool sleeves.
Avoid moisture; never apply liquids near vents or connectors.
If you smell smoke, see scorch marks, or feel uneven heat, stop and escalate.

Confirm it stuck

On a Dell device, the test is rarely "reboot and see". Use this list:

Active reproduction: trigger the original failure path on purpose.
Indirect reproduction: do an activity that would expose the same subsystem.
Status indicator review: every LED / display / app status should be green.
24-hour soak: leave the device under normal load overnight; check the next morning.
Telemetry check: review the device or app's diagnostic log for new error entries.

When to call Dell support instead

Escalate if:

The same symptom returns within 24 hours of a clean fix.
You see physical damage (burn marks, swollen battery, cracked PCB).
The device is in warranty and a hardware replacement is the cheaper outcome.
Repair requires specialised tools you don't own (alignment jigs, calibration software).
Following the official path keeps the warranty intact, which matters more than the time spent.