@Dale5403 When installing an update on my truck my result was much the same as yours. The drive was new and formatted correctly the files were nested as they should be but no soap. I bought a little more high-end Samsung thumb drive and started over, it loaded just as it should in short order.
Others on the F150Ecoboost forum had the same issue. I sent that same drive to several more members and it worked for them in each case. They were all great members. I was just giving any of them the drive. They all sent it back to me and a couple of them threw $5 in to cover my shipping costs (totally unnecessary). I was just glad it helped them out. Do make sure that the files reside where they are supposed to on the drive according to Ford's instructions.