For $29/mo, we provide access to advanced level technicians who will answer your questions on any Macbook board related matter to the best of their knowledge promptly & walk you through how to solve your problem so you can deliver a working board to your customer.
Read and follow the instructions.
Don't forget to force the machine off, pressing onoff switch for 8s; is the first step.
Then press DFU switch alone, for aprox 3-5s.
You have almost fully working machine, which can't put into DFU.
I don't understand why.
Strange to think that M1 damage on audio side can block it in this way...