Joagbaje: God will forgive him, just as he will forgive anyone who repents. The only problem here is that satan will never repent nor ask for forgiveness for 2 reasons. He doesnt have ability to repent. he was not created in the image of God like man. Man has ability to repent, but angelic beings have no such ability. secondly satan has his personal pride. he is still looking for opportunity to overthrow God. amd he believes its still possible. he will still launch out 2 major battles against God before his final damnantion. according to the book of revelation. the final war is Gog and Maggog

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Rev 20:8
8 And shall go out to deceive the nations which are in the four quarters of the earth, Gog and Magog, to gather them together to battle: the number of whom is as the sand of the sea.

On point! Though I don't know about those Gog version though.

https://www.youtube.com/watch?v=4URKHvdky8g&t=14s

https://www.youtube.com/watch?v=LxiOheZe4ks&t=28s