If Satan was created by God he is one of his children, even though fallen. If at a certain time, Satan sees he has lost and the power of God’s love prevails, could he not surrender and beg forgiveness and be saved?
The Bible, having been written to and for mankind, is silent on the matter of the redemption of angels. All we know is if there is a provision for their redemption it was not included in God’s plan for the redemption of mankind. Hebrews 2:14-18 tells us Jesus had to become a man to save mankind. In Hebrews 2:16 the writer said, “Surely it is not angels He helps but the sons of Abraham.”