Decompression OK, trailing garbage ignored

Installing and Using OpenWrt
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gzip -d openwrt-23.05.2-x86-64-generic-ext4-combined.img.gz

gzip: openwrt-23.05.2-x86-64-generic-ext4-combined.img.gz: decompression OK, trailing garbage ignored

sha256sum is correct
Is my approach wrong?

2

Ignore it.

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The images have "image metadata" attached, behind the compressed payload. If you write the image to your disk manually, you can just ignore this (gzip does not know about it and rightfully considers it as trailing garbage and ignores it). If you use sysupgrade to upgrade your OpenWrt installtion, you should not decompress it beforehand and feed it to the sysupgrade binary completely (which knows about how to handle the image metadata).

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