Upgrade Failure

Nokia 7250 IXR-R6: How to perform a controlled upgrade with rollback safety net

Q: Where can I find the Nokia official documentation?

https://documentation.nokia.com — 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	Nokia
Operating system	SR OS / SR Linux
Category	Upgrade Failure
Skill level	Intermediate to advanced
DIY-able?	Yes with CLI access; some scenarios need Nokia Customer Care + RMA.

Upgrade work on a Nokia fleet is mostly about discipline. SR OS / SR Linux gives you the commands; the failure mode is almost always operator error. wrong image for the platform, integrity not checked, no rollback plan. The 7250 IXR-R6 family is no exception.

I always do a one-box pilot before a fleet roll. file copy cf3:/timos-21.10.R1.tim cf3:/timos.tim 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.

Nokia Customer Care 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

Perform a controlled upgrade with rollback safety net on a Nokia 7250 IXR-R6 (SR OS / SR Linux).

Step-by-step

Back up the current running config and image.
Download the new image and verify checksum.
Activate the new image; do NOT commit if the platform supports staged commit.
Verify production traffic on the new image.
Commit if healthy, or rollback within the safe window if not.

CLI / commands

# Boot recovery prompt: BOF> (Boot Options File)

# Verify image
show version

# Upgrade
file copy cf3:/timos-21.10.R1.tim cf3:/timos.tim

# Save / commit
admin save

# Rollback
rollback

Recovery options

Boot loader recovery (BOF> (Boot Options File))
Rollback to the previous image with rollback
Force failover to a known-good standby (HA platforms)

Frequently asked questions

Will this work on my specific SR OS / SR Linux version?

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

Should I open a Nokia Customer Care 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 Nokia official documentation?

https://documentation.nokia.com: 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 Nokia fix guides → /nokia/
All vendor guides → /vendors/

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

References

Nokia support portal: https://customer.nokia.com
Nokia knowledge base: https://documentation.nokia.com
Nokia security advisories: https://www.nokia.com/about-us/security/vulnerability-management/
Open a case: https://customer.nokia.com

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

What changed recently?

Fault diagnosis on a Nokia device goes faster when you map the symptom to a recent change:

Did firmware update in the last 7 days?
Did the network (router, ISP, VPN) change?
Was the device moved physically?
Did paired devices (phone, hub, app) update?
Were any accessories swapped in or out?

The answer narrows the root cause to a manageable subset.

Safety + preconditions

Before any work on a Nokia 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.

How to confirm it's actually fixed

On a Nokia 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.

Escalation guide

For a Nokia device, the right escalation depends on impact:

Cosmetic / minor: log a ticket via the Nokia app or web portal. Response 1-3 business days.
Mid-impact: phone support. Have your serial number ready.
Critical (production down, safety issue): in-person dealer / TAC visit. Bring proof of purchase.
Out of warranty: third-party repair shop with manufacturer-certified technicians.