Installing Magisk on a Samsung Galaxy F41 device with Android 12 can sometimes result in a frustrating 'HASH_MISMATCH (3)' error, preventing the device from booting. This error often occurs after patching the AP file using the Magisk app and attempting to flash it with Odin. While successful flashing of the official, unpatched firmware confirms that the device and Odin are functioning correctly, the issue persists with the Magisk-patched AP file. This indicates a potential problem with the patching process itself or compatibility with the specific firmware version. Understanding the cause of this error is crucial for resolving it. Here's what could be happening and how to troubleshoot it:

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