Braiins firmware nukes your hashrate if it cannot talk to their license server. Comments in the code say 15% but their license online says 5%.

https://braiins.com/os/plus/license

https://github.com/braiins/bos-plus-api/blob/134529b0b28a826c86dada5f66fb0a0a133cf86e/proto/bos/v1/license.proto#L51