Just to make this clear as I can't edit MY old post.
You DO NOT NEED TO Use the Intermediate Firmware of 70.00.100A if your CURRENT Version is 56.00.100 or anything NEWER, that is 56.00.200, 56.00.650, 58.00.240, 59.00.100, 59.00.342A or 70.00.021.
You go straight to 74.00.324A EU N or 4A N...