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For WRT54G v1-4.

Version: 4.21.1

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Check your router model version number

It's a good idea to be extra careful with firmware upgrades because a failed upgrade can leave you with a dead device.

In this case, the 4.30.5 firmware is for WRT54G v1-v4.

WRT54G v5-v6 models have different firmware with a different numbering system: 1.00.9

Check the model version number on the bottom of your WRT54G router, and match it to the looooong form menu on the Linksys Downloads page.