参考资料：

https://forum.xda-developers.com/t/tool-win-lin-and-darw-super-image-tools-extract-or-make-partitions-rw-in-super-partition.4120963/

https://github.com/munjeni/super_image_dumper

https://gist.github.com/Systemad/0dd94142e73c7338b3b369ba1a628f5a

步骤：
从super分区 提取 可些的system.img

cd /data/local/tmp
chmod 755 superunpack.arm64_pie
./superunpack.arm64_pie /dev/block/bootdevice/by-name/super  1

挂载 system_a.img

mount -t ext4   system_a.img  system
如果上面，unpack不加1选项，system分区是只读的， mount是需要加 ro选项
mount -t ext4 -o ro  system_a.img  system

修改

删除，替换文件

写回

cd /data/local/tmp
mv superrepack.arm64_pie superrepack
chmod 755 superrepack
stop
./superrepack /dev/block/bootdevice/by-name/super system_a
sync
--------------------
stop
dd if=/dev/block/bootdevice/by-name/super of=/data/local/tmp/super.bin conv=notrunc
/data/local/tmp/superrepack /data/local/tmp/super.bin system_a rw
sync
dd if=/data/local/tmp/super.img of=/dev/block/bootdevice/by-name/super conv=notrunc
sync

在Linux系统也可修改 super.img 镜像

e2fsck -fy -E unshare_blocks system.ext4

-f                   Force checking even if filesystem is marked clean
-y                   Assume "yes" to all questions
-v                   Be verbose
-E extended-options

superunpack 不加 1选项，或者 lpunpack 或者 imgtool都提取的read only的image

/usr/sbin/e2fsck -f  system_a.ext4
/sbin/resize2fs system_a.ext4 4G
/usr/sbin/e2fsck -fyv  -E unshare_blocks  system_a.ext4

挂载

# mount -t ext4 -o loop,rw system_a.ext4

修改

修改后重新检查

e2fsck -f 

改成可写的分区

mount -o remount,rw  /
mount -o remount,rw  /system_ext
mount -o remount,rw  /product
mount -o remount,rw  /vendor
mount | grep dm-

使用方法

adb push superrepack.arm64_pie /data/local/tmp
adb shell
su
cd /data/local/tmp
mv superrepack.arm64_pie superrepack
chmod 755 superrepack
stop
./superrepack /dev/block/bootdevice/by-name/super system_a
sync
reboot