Second try.
My case. I have usual Antminer S9 and I'd like to install braiins-os. It is working only from SD card now. I cannot to install it onto memory and cannot upgrade firmware via upgrade command
[...]
There's a command to remove and clean the os on their wiki. Do that. Maybe hard reset the s9 with the reset in, and powering it on. Then wait and see if it goes through the normal preheat test.