Will wiiflow loader work on newly updated 4.3u ?
Yeah, just follow the wiiflow guide. It will work on any version Wii as long as you have properly softmodded it.
Click here for useful links
Softmod any Wii guide Yes ANY Wii!!!
FAT32 Hard Drives - Formatting, Loading, Ripping, Playing (recommended USB setup)
Ultimate List of Troublesome Games & Solutions
The Noob's Guide To Getting Help
How to Run & Post a System Check
Blackscreens & Freezes - Causes & Solutions
Try searching with this!!!