The SE (and K) are not supported (don't work) with BraiinsOS yet. I think i left various links in that thread pointing for possible methods to regain SSH, but those models came with SSH access disabled from factory because they are 2019 models. I believe you can still control the fans using some html trickery with the factory firmware.

The bOS team plans to add support to more hardware such as the S17 after the next release.

One of the reasons they rewrote cgminer from scratch in rust (called bosminer) was precisely to ease adding more hardware.