Internet & modems

Modem firmware update seems stuck

Modem firmware updates are usually pushed automatically by the provider and can take longer than expected, so a modem that seems 'stuck' updating often just needs patience, though a true stall does eventually require a restart.

Difficulty
Easy
Time
20–60 minutes
DIY cost
$0
Pro cost
$0–$100

Symptoms

  • Modem's lights show an unusual pattern described as 'updating' in the manual
  • No internet access while the pattern persists for an extended period
  • Modem was working fine before an update notification or automatic update began
  • Restarting the modem doesn't seem to change the light pattern

Likely causes

  • CommonUpdate is still legitimately in progressFirmware updates, especially for modems, can take 10–20 minutes or occasionally longer, which can feel like it's stuck when it's actually still working.
  • PossibleUpdate process genuinely failed or hungOccasionally an update process does get stuck and requires intervention to recover.
  • PossiblePower interruption during the update corrupted the processIf power was lost while updating, the modem may be in a partially updated, non-functional state.

What to do

  1. Wait at least 20–30 minutes without touching the modem, since firmware updates can legitimately take this long, especially over a slow initial connection.
  2. Do not unplug the modem during this waiting period, since interrupting an active update can cause more serious problems.
  3. After waiting, check if the lights have returned to a normal pattern.
  4. If lights still show the same 'updating' pattern well beyond the expected time (consult the manual for typical duration), try a single power cycle: unplug for 30 seconds and plug back in.
  5. If the modem still shows an update-in-progress or abnormal pattern after a restart, contact your ISP, since they may be able to push the update again remotely or determine if the modem's firmware was corrupted.
  6. If the modem is confirmed to be in a corrupted state from an interrupted update, your ISP will typically need to replace it rather than attempting a manual recovery.
  7. Going forward, avoid unplugging modems during any period when an update might be running, such as overnight when many providers schedule automatic updates.

When to call a pro

If a firmware update appears to have corrupted the modem after a failed or interrupted process, contact your ISP for a replacement, since this typically can't be fixed at home.

Safety

Generally low risk

Generally low risk for a careful person. Stop if anything looks different from what this guide describes.

Related guides

Operator provides AI-generated troubleshooting information. It can be wrong. For safety-critical, electrical, gas, structural, medical, automotive safety, or other high-risk problems, consult a qualified professional.