Samsung devices do not use fastboot .
Once the stock file is acquired, the Magisk application must perform the modification directly on an Android device. Step 1: Prepare the Files boot img for magisk download
Transfer the extracted stock boot.img file to the internal storage of the device. Step 2: Execute the Patching Process Launch the on the device. Samsung devices do not use fastboot
I needed the stock boot image to patch with Magisk for rooting my device. This page provides direct download links for boot.img files extracted from official firmware. Here’s my honest take: Step 2: Execute the Patching Process Launch the
Once you have the stock image, the "magic" happens inside the Magisk app.
Magisk does not provide generic boot.img files for download. Users must extract the file from official stock firmware packages matching their specific device model and carrier variant. Official Manufacturer Resources