Hey, here is the step by step

To install braiins os directly via webgui on your antminer, follow these steps

-First, log into the antminer webgui.
-go to system  upgrade
-download braiins os from the official website and save the file
-in the webgui, open the upgrade option and upload the downloaded file
-click "upgrade" and wait for the installation to finish
-after the restart, your antminer will be running braiins os

I’ve searched a lot, this should work fine
All the best!