Brake switch is closed as in the pictures before.
It should not matter since he disabled the function in the controller settings. When the function is disabled the controller doesn't take into account the input of the brake/stand signals anymore.
Just show your undervoltage settings. The controller is a dumb thing. When you have set undervoltage to maybe 80V it will show you an undervoltage alarm.
He posted them on the previous page, right now the undervoltage limit is set at 56V.
That's a bit strange,
@Albie72 I suggest you check your wiring again, maybe there is a bad connection or a defective wire in your harness.
Could be that some power connector at the battery isn't secured, you try to draw current from it, but since the connection isn't proper you suddently get more resistance, leading in voltage drop, then controller restarts and beeps because the controller will do that if you switch it on while throttle is applied (it's a safety measure).
That could explain why it worked before and now it doesn't work anymore, maybe some wire got cut or is making bad contact, this can happen sometimes when crimping improperly.
So I guess I'd check the connections in the battery as well as all the part of the harness that is linked with ignition (especially the key switch that can be defective). Maybe start with the key switch as it is the easiest.