Well, there’s your problem. You’re trying to apply a legitimate update on a player that’s been up on bricks via a third party! Go back to the place that flogged you the multiregion version for support. Panasonic certainly won’t go near it.
Although i had issues with the first UB450 that I had (see above -- player had unreleased firmware on it) I've just ordered a second machine from JL to try again. This time the player will be used as a bedroom machine, and I note that new firmware, version 1.15 is up for grabs. Fingers crossed that this player is better than the last!