because newer official updates from Nintendo (like those found in system menu 4.2 or 4.3) patched the Trucha bug. cIOS Installation
: Installing an incorrect or corrupted WAD file to a system slot can result in a "brick" (rendering the console unusable). It is highly recommended to have BootMii and Priiloader installed as safeguards before modifying system WADs. ios36-64-v3351.wad
Always ensure you have Priiloader or BootMii installed before messing with System WADs. Deleting or corrupting an IOS that the System Menu relies on can lead to a "brick," making the console unusable. because newer official updates from Nintendo (like those