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
Wilbrand – WiiDatabase
How to Softmod Your Wii (4.3) U/E/K/J : 4 Steps - Instructables
How to Install the Homebrew Channel on a Nintendo Wii the Easy Way
Voor alle versies: firmware 4.0e, firmware 4.1e, firmware 4.2e, Firmware 4.3e - PDF Gratis download
How to Install the Homebrew Channel on the Wii U (with Pictures)
New WII with firmware 4.3E; where to start? | GBAtemp.net - The Independent Video Game Community
RetroROM] Nintendo Wii Japan : Free Download, Borrow, and Streaming : Internet Archive