While Microsoft has apparently fixed their installer so that users can feel free to install the Fall Update, firmware hacker Commodore4eva has dug into the update to determine why users with hacked consoles are having issues. His determination is that Microsoft has implemented a combination DVD device and firmware version check in the kernel, possible as an attempt to block hackers. The implementation, according to Commodore4eva, stores a stock factory drive and version code on the Xbox 360 and will compare this version against the current version in the drive. Because some of the hacked firmware versions are based on older versions than what Microsoft believes to be current, these drives will fail the check and give an E66 error.