Upgrade Paths

Nokia 7250 IXR-S: Upgrade Path to latest LTS / GA

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 Paths
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

Upgrade procedure for Nokia 7250 IXR-S to latest LTS / GA (SR OS / SR Linux).

Notes specific to this combination

Verify the supported upgrade path in the Nokia release notes before proceeding. Some SR OS / SR Linux releases require an intermediate hop; some support direct upgrade.

Step-by-step

Verify current version: show version.
Read the release notes for supported upgrade paths.
Confirm minimum RAM / disk for the target release.
Download target image; verify checksum.
Schedule maintenance window.
Back up running configuration.
Copy image to local flash.
Run file copy cf3:/timos-21.10.R1.tim cf3:/timos.tim.
Reboot: admin reboot now.
Verify; admin save if healthy.

CLI / commands

show version
show chassis
file copy cf3:/timos-21.10.R1.tim cf3:/timos.tim
admin save

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.

Verification checklist

After applying the fix on your Nokia device, confirm:

The original symptom is no longer reproducible.
Related features (status LEDs, app sync, paired accessories) still work.
The device responds to a soft reboot without the fault returning.
Any error codes that were on display have cleared.
Documentation (your service log, the brand companion app) reflects the change.

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.