No, it's not. Otherwise it wouldn't be saying FXZ not found. Ensure that the 905_FXZ directory exists and has the FXZ files in it. And it should be part of the SamuriHL_HouseOfBionic directory.
thats the part that screwed me up. 905_FXZ was not in the HOB directory.....and if i recall correctly i dont remember seeing that being part of the instructions.
Never the less I faked out the system. I looked through the code and saw that it was looking for any kind of folder with "_FXZ" in the name....so i made a fake folder and got it to work. Then during the update process i got Error Code 7....which I remember getting as a result of having safe strap installed.
In the end i FXZ'ed back to GB and did the update process the OTA way