The -d flag stands for decompress. You will see an output size roughly 2-4x larger than the original.

This file is the primary target for rooting methods like Magisk . To root a modern Samsung device, you generally must: Extract the boot.img.lz4 from the official firmware. Decompress it into a standard .img file. Patch the .img file using the Magisk app.

brew install lz4

boot.img.lz4

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