There's only one way, first you need to download the ios_16 wad manager and the .wad, then you need an IOS Downgrader to downgrade the ios,
then you need to reinstall the ios_16 wad (i think)then the cIOS downgrader to change the system menu. and finally, everything is back the way it was, but since you didnt update, you cant access some channel, well dont worry, use the IOS54 patch
The Whole Pack (Wad Manager ios16 and the wad, the cios downgrader and the ios downgrader) can be found here:
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http://rapidshare.com/files/158782142/WiiWadTools.zip
please send a message to [email protected] if it worked
