Firmware updates without surprises

By the PrintDoc network team · 8 min read · Updated October 2026

Most people put off router updates because they are afraid of breaking the office internet. That fear is reasonable — and easy to manage. This is the procedure we follow on every visit.

1. Download only from the vendor

Use the vendor's support page for your exact model and hardware revision. Hardware revision matters: the v1 and v2 of the same router can need completely different images.

2. Verify the image before flashing

Compare the checksum published by the vendor with the file you downloaded:

macOS / Linux: shasum -a 256 firmware.bin
Windows PowerShell: Get-FileHash firmware.bin -Algorithm SHA256

If the vendor also publishes a signature, verify it. A mismatch means stop — do not flash.

3. Back up the configuration first

Export the configuration from the admin panel and store it next to the old firmware file. On OpenWrt: System → Backup / Flash Firmware → Generate archive.

4. Keep a rollback path

Know how to get back before you start: the vendor's recovery mode, a dual-boot partition, or the previous image on a USB stick. Write the steps on the update log.

5. Flash over a cable, outside office hours

Never flash over Wi-Fi and never on a power strip someone might switch off. Allow 15 minutes of downtime; it is usually less than five.

6. Check, then record

Internet, Wi-Fi and printing work from a staff device.
The admin password, firewall rules and port forwards survived the update.
The new version, date and checksum are written in the update log.

Automatic updates are fine for home routers. In an office, prefer notifications plus a scheduled manual update, so you choose when the network blinks.

Want us to do this for you? A PrintDoc technician can audit and harden your office network in a single visit — book a network audit.