The Web UI is represented by one file : index.hml.gz

The full package with all languages is available here

But it may not fit your available size on flash, so you can select a single language package here which is lighter and will fit smallest boards.

Upload index.html.gz

Using embedded uploader

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If the embedded is not visible, you can access to it using: http://your_IP_address?forcefallback=yes anytime

Using Web UI

You can upload file using Web UI

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Finalize update

Refresh the page to http://your_IP to display updated Web interface.

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Note: you can also upload a customized favicon.ico