On July 26, 2011, there was a new/updated document posted on the ASUS Support site.
This link takes you to the [English Version] ASUS Transformer STANDARD OPERATING PROCEDURE FOR SYSTEM FIRMWARE UPDATE. Other versions are available.
Note: You must be a registered ASUS Transformer user to login and download this file:
This information will be a helpful tool to those who either want to execute an update, or seek to addres issues that prohibit them from getting an update (based on settings).