You can use instance.setDataValue('deletedAt', null):

var Bluebird  = require('bluebird');

var models    = require('./models');



models.sequelize.sync({ force: true })

.then(function () {

  return models.User.create({ name: 'user' })

})

.then(function (user) {

  return user.destroy()

})

.then(function () {

  return models.sequelize.models.User.findAll({ paranoid: false });

})

.then(function (users) {

  var user = users[0];

  user.setDataValue('deletedAt', null);

  return user.save({ paranoid: false });

}).then(function () {

  return models.sequelize.models.User.findAll();

}).then(function (users) {

  console.log(users[0]);

});

Please note that this snippet uses Sequelize@v2