adb remount
adb push busybox /system/bin/busybox
adb push dump_image /system/bin/dump_image
adb shell
chmod 755 /system/bin/busybox
chmod 755 /system/bin/dump_image
/system/bin/dump_image boot /sdcard/boot.img
/system/bin/busybox tar czvf /sdcard/systemdump /system