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 Install D2X cIOS On Any Wii Version 4.3! - YouTube
How To Hack Any Nintendo Wii 3.0 - 4.3 - Homebrew Channel - Letterbomb Exploit - Softwii [HD] - YouTube
Nintendo Wii Update 4.3 - YouTube
Firmware Updater | Wii.SceneBeta.com
Wii update from 4.0E то 4.3E | GBAtemp.net - The Independent Video Game Community
Unable to update Wii to 4.3e - Wii-Hacking - Wii-Homebrew.com Board
My Nintendo Wii wants me to update. | GBAtemp.net - The Independent Video Game Community
How to Softmod Your Wii (4.3) U/E/K/J : 4 Steps - Instructables
COMO ATUALIZAR QUALQUER WII PARA 4.3 (MÉTODO DO JOGO ORIGINAL) - YouTube
ANIMAL CROSSING wii menu 4.3 pal | GBAtemp.net - The Independent Video Game Community