* This blocks new installations of anything fakesigned, that is, Homebrew Channel (both new installs and updates), unofficial wads (legal and illegal), Starfall, cIOS, BootMii, anything that installs IOSes secretly like AnyRegion Changer or AnyTitle Deleter, xyzzy and DVDX (used for apps which have DVD support). This list is not exhaustive, but please add to it if you think of anything else.
* This also blocks access to /dev/flash in all IOSes but IOS30, IOS31 and IOS37. This means raw nand dumping utilities, for example Yet Another Wii NAND Dumper, no longer work, since by default homebrew uses IOS35
* If something is already installed then it isn't affected, like Homebrew Channel, etc.
* The homebrew developers are already planning how to work around this update.
* You currently need this update to access the Wii Shop Channel.
* If you already have the Homebrew Channel and DVDX, and aren't planning to install anything big that will affect your Wii, then you are most likely unaffected. Normal everyday apps such as Homebrew Browser are completely unaffected as long as you already have the Homebrew Channel.
* It updates all IOSes with the fakesigning bug, and adds IOS51. .