Wii update from 4.0E то 4.3E | GBAtemp.net - The Independent Video Game Community
HollenbackDotNet - Wii Hacking Guide
Unable to update Wii to 4.3e - Wii-Hacking - Wii-Homebrew.com Board
LetterBomb - Wii Guide
Pimp My Wii - GameBrew
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