Old devices won't connect after upgrading to a new router

Symptoms

• Older phone, tablet, or smart device can't find or join the new network
• Device that worked on the old router fails silently on the new one
• New router's default security or band settings exclude older hardware
• Device shows the network but connection attempts fail or time out

Likely causes

• CommonNew router defaults to WPA3-only or 5GHz-only in some configurationsNewer routers sometimes ship with stricter defaults that older devices don't support.
• CommonOld device still has the previous router's network name and password savedIf the new network has a different name, the device needs to be told about it fresh.
• PossibleOld device's Wi-Fi hardware only supports older standards (Wi-Fi 4 or earlier)Very old devices may not be compatible with newer router configurations at all, regardless of settings.

What to do

1. Check the new router's wireless security setting and switch it to WPA2/WPA3 mixed mode if it's currently WPA3-only.
2. If the router supports separate 2.4GHz and 5GHz network names, make sure the older device is trying to join the 2.4GHz one.
3. Keep the same network name and password as the old router when setting up the new one, if practical, so devices reconnect automatically without any changes.
4. On the old device, forget the previously saved network and search for and join the new one fresh.
5. Update the old device's software if an update is available, since Wi-Fi compatibility fixes are sometimes included.
6. Restart the old device, since a stuck network stack can prevent it from properly scanning for the new network.
7. If the device is very old (many years) and still can't connect, its Wi-Fi hardware may simply not be compatible with your new router's minimum settings.

When to call a pro

Not usually needed for this issue.

Safety