Quoted from jgentry:

So I downloaded 1.03 code again last night. Used an brand new 32g flash drive and still couldn't get the upload to start. When I put the flash drive in and boot the game it just goes into the normal attract mode. I did notice that the download had 2 files. One huge one and one much smaller one. Do I need to delete the smaller file? I've never had any issues updating code on stern games before, so I'm not sure what I'm doing wrong.

Quoted from djreddog:

It should be 2 files.
Update instructions:
Download the zip file
Unzip the file, this will create a folder that contains two files
Open folder, copy only the two files to the root level of a USB stick. Do not copy the folder.
Power game off
Insert USB stick
Turn on game
After game boots up it will give the option for software update
Volume buttons change options for full or quick update. Enter selects the option and starts the update.
Once update is completed game will prompt user to power game off and remove USB stick.