After 2 months of having a bricked M1 Macbook Air I have to say that the only way to fix it if every other method has failed, is taking it to an apple store and booking an appointment with the genius bar. Or if you have a secondary mac at home, you can try downloading an ipsw file that apple provided to fix this issue and use apple configurator 2. I haven’t been able to fix mine because All apple stores in California are closed, this whole situation is bullshit ngl lol, I should’ve just built a pc instead.