Car radio cable fire

Hello, I changed my car radio a few days ago. Unfortunately it didn’t fit in properly, and so I temporarily “clamped” it into a universal cage. Should only be a temporary solution anyway. I had a few problems with the backup from the radio when installed (flog out constantly because the remote cable was not connected) The error was found quickly. But because I did not have a 20A fuse, which is normally installed on the radio, more I had a 10A Si It worked great, no problems at all. Today I wanted to push the radio a little bit backwards. The remote cable must have solved itself again. Follow: The yellow cable to the radio glowed very brightly, it smoke detachment and I immediately had to leave the radio almost already. Ignition off, safety out. Backup was still complete! My question is now: Can someone estimate how profound the damage is and whether it is reparable? Why? Has the fuse not grasped and flew out? With a smaller one it should fly out even faster? LG S.R. Picture in the appendix: Bottom green marking: Remains of the rotted yellow cable, insulation completely way, copper extremely brittle. At the top green marking: That’s where the yellow cable went into the car. Looks like almost the entire shielding was burnt on and thus the entire car. Other markings: Schmorrstellen, which were created by the heat of the yellow cable.