TEST:/dev/block/by-name $ ls -l
total 0
lrwxrwxrwx 1 root root 21 2022-01-16 00:33 backup -> /dev/block/mmcblk1p11
lrwxrwxrwx 1 root root 20 2022-01-16 00:33 boot -> /dev/block/mmcblk1p9
lrwxrwxrwx 1 root root 21 2022-01-16 00:33 cache -> /dev/block/mmcblk1p13
lrwxrwxrwx 1 root root 20 2022-01-16 00:33 dtb -> /dev/block/mmcblk1p6
lrwxrwxrwx 1 root root 20 2022-01-16 00:33 dtbo -> /dev/block/mmcblk1p7
lrwxrwxrwx 1 root root 21 2022-01-16 00:33 frp -> /dev/block/mmcblk1p18
lrwxrwxrwx 1 root root 20 2022-01-16 00:33 kernel -> /dev/block/mmcblk1p5
lrwxrwxrwx 1 root root 21 2022-01-16 00:33 metadata -> /dev/block/mmcblk1p15
lrwxrwxrwx 1 root root 20 2022-01-16 00:33 misc -> /dev/block/mmcblk1p3
lrwxrwxrwx 1 root root 21 2022-01-16 00:33 oem -> /dev/block/mmcblk1p17
lrwxrwxrwx 1 root root 21 2022-01-16 00:33 recovery -> /dev/block/mmcblk1p10
lrwxrwxrwx 1 root root 20 2022-01-16 00:33 resource -> /dev/block/mmcblk1p4
lrwxrwxrwx 1 root root 21 2022-01-16 00:33 security -> /dev/block/mmcblk1p12
lrwxrwxrwx 1 root root 21 2022-01-16 00:33 system -> /dev/block/mmcblk1p14
lrwxrwxrwx 1 root root 20 2022-01-16 00:33 trust -> /dev/block/mmcblk1p2
lrwxrwxrwx 1 root root 20 2022-01-16 00:33 uboot -> /dev/block/mmcblk1p1
lrwxrwxrwx 1 root root 21 2022-01-16 00:33 userdata -> /dev/block/mmcblk1p19
lrwxrwxrwx 1 root root 20 2022-01-16 00:33 vbmeta -> /dev/block/mmcblk1p8
lrwxrwxrwx 1 root root 21 2022-01-16 00:33 vendor -> /dev/block/mmcblk1p16

root権限無しだとoem解除しただけじゃ抜き出し無理な感じですかね…？