Downloaded a sysupgrade.img.gz openwrt 24.10.5 from firmware selector
OSX intel + usbimager cocoa intel 1.0.10 = crash on launch
gunzip sysupgrade.img.gz in terminal yields
trailing garbage ignored
dd resulting sysupgrade.img to SD card and boot seems without error.
sysupgrade image has metadata after the end of gzip file, the "garbage" is expected.
You can use dd as on normal linux, or the default disk manager to transfer image to sd without any extra tools.
Not unusual.
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