Unfortunately I am a windows/gui guy and the BrainsOS flashing thing is going to be agonizing for me.
It's the 21st century. Why are we still doing this command line crap?
When you have no other options you are forced to use whatever tools at your disposal, you bought a shitty mining gear before doing your own research, that was a mistake that you have to accept.
There is a bootable version of Braiins, you could try that and see if it fixes your problem, later on, you can flash the firmware if you are happy with that, if you face any difficulties in the process, you can always ask in BraiinOs topic, someone should be able to help you.