After performing a successful connection test on a 4.3U console, this message pops up after agreeing to perform a system update (details in comments) : r/WiiHacks
How To Hack Any Nintendo Wii 3.0 - 4.3 - Homebrew Channel - Letterbomb Exploit - Softwii [HD] - YouTube
How to Softmod Your Wii (4.3) U/E/K/J : 4 Steps - Instructables
The Homebrew Channel Custom Forwarders : Free Download, Borrow, and Streaming : Internet Archive
I am trying to get the latest update, 4.3 I think it was, so I can install the homebrew channel. But the update won't install. Please help! : r/WiiHacks
Wii U - Wikipedia
How to Install Homebrew on Wii Menu 4.3 (with Pictures) - wikiHow