The best thing is that if you ever have need of the upgraded version then you can upgrade again as usual, switching back and forth between versions as much as you want, according to WiiFanboy. The original v1.0 Photo Channel will then become available to you again via the main Wii menu screen. From here select the Channels tab and then choose and delete the Photo Channel in its entirety.

The downgrade returns the Photo Channel to v1.0 and is available by navigating to the Data Management section of the console (located in the Wii Settings section). The response was so universally negative in fact, with petitions and sites being formed to protest the upgrade, that Nintendo has now offered a downgrade for anybody who wants to play MP3s via the Wii.

It was the first upgrade the channel had received, taking it to v1.1.

A few days ago Nintendo turned some of its staunchest fanboys against the Wii by issuing an upgrade to the Nintendo Wii Photo Channel which subsequently removed support for MP3 files played from SD cards.

Delete wii channels