Can souls in hell be forgiven out of God's Divine mercy on Final Judgement?

Do souls in hell have any hope for the forgiveness of their sins? According to Catholic teachings, once a person died, there are 3 places where a soul can be placed: hell, purgatory and heaven. At the time of death, if a soul will be judged and damned to hell, is it possible to be in friendship or be reconciled with God again? What about the Final Judgement where there could be repentance and prayers for these souls in hell?