If you have hacked/homebrew wii, you'll notice that Nintendo released a new Shopping Channel update (v21). In order to download the new update, you need to upgrade your wii system. I'm on wii system 4.2 and for some reason Nintendo won't let me download the new system update. So here's how to install the new Shopping Channel without updating the wii system...
1. Download the Shopping Channel v21 wad and stick it on the /wad folder on your SD card.
2. Use either Multi Mod Manager or Wad Manager, from the Homebrew Channel. If you don't have the homebrew channel, see here.)
3. Either 'Load another IOS' or load the wad directly.
4. It might take a few moments, but the wad will install. Exit the app, exit homebrew, and open the Shopping Channel. It should be working again.
--- Donezo!