Set the path to your custom character in server/middleware.json :
{ "initial:before": { "loopback#favicon": { "params": "path/to/your/favicon.ico" } }, …
We had problems setting paths only in HTML, with some reboots the StrongLoop sign icon still appeared by default. This configuration helped.
PS: If your favicon.ico is in the root directory of the client, use this path: "$!../client/favicon.ico"
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