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The boot partition of the DNS-313 factory image differs between builds: -Linux rev 1.0 ext2 filesystem data, UUID=9f7d7721-0bf7-4483-bd56-b539d195f181 +Linux rev 1.0 ext2 filesystem data, UUID=d3ca4870-378b-48dd-9b05-760812dfeb81 -drwxr-xr-x ... 2026-09-23 07:37:23.000000 ./.boot/ +drwxr-xr-x ... 2026-09-23 09:38:09.000000 ./.boot/ genext2fs copies the mtimes of the staged files from the host and adds them in readdir() order, which also decides their inode numbers and blocks. It leaves the UUID empty, so e2fsck fills in a random one, and e2fsck stamps the last check with the current time. Pass genext2fs a name sorted tarball with mtimes clamped to SOURCE_DATE_EPOCH and group/other write bits cleared, derive the UUID from IMG_PART_DISKGUID and run e2fsck with E2FSCK_TIME set to SOURCE_DATE_EPOCH. Link: https://github.com/openwrt/openwrt/pull/25358 Signed-off-by: Paul Spooren <mail@aparcar.org>