[h815] /system read only

Hi xda,

i need somme help,
i have à h815 with bl unlock, twrp 3.0.0.0, stock V20d, root, xposed.
but i can not change permission in system partition #strange
root browser, solid explorer, es, can copy or rename in system partition but when i change permission, the operation failed and the system partition past to read-only and unable to remount

same with adb (i use adb insecure) , :

C:\Users\user>adb shell
shell@p1:/ $ su
su

root@p1:/ # getenforce
getenforce
Enforcing

root@p1:/ # setenforce permissive
setenforce permissive

root@p1:/ # getenforce
getenforce
Permissive
root@p1:/ #

C:\Users\user>adb shell #enable adb insecure (chainfire app)
root@p1:/ # ls system/media -la
ls system/media -la
drwxr-xr-x root root 2016-01-15 10:28 audio
-rw-r--r-- root root 8979780 2016-01-15 10:28 bootanimationold.zip
drwxr-xr-x root root 2016-01-15 10:28 gallery
drwxr-xr-x root root 2016-01-15 10:28 ims
-rw-r--r-- root root 4281625 2016-01-15 10:28 shutdownanimation.zip

root@p1:/ # cp sdcard/download/bootanimation.zip system/media/bootanimation.zip
nload/bootanimation.zip system/media/bootanimation.zip <
cp: system/media/bootanimation.zip: Read-only file system

1|root@p1:/ # mount -o remount rw /system
mount -o remount rw /system

root@p1:/ # cp sdcard/download/bootanimation.zip system/media/bootanimation.zip
nload/bootanimation.zip system/media/bootanimation.zip <

root@p1:/ # ls system/media -la
ls system/media -la
drwxr-xr-x root root 2016-01-15 10:28 audio
-rw------- root root 46802200 2016-03-03 14:54 bootanimation.zip
-rw-r--r-- root root 8979780 2016-01-15 10:28 bootanimationold.zip
drwxr-xr-x root root 2016-01-15 10:28 gallery
drwxr-xr-x root root 2016-01-15 10:28 ims
-rw-r--r-- root root 4281625 2016-01-15 10:28 shutdownanimation.zip

root@p1:/ # chmod 0644 system/media/bootanimation.zip
chmod 0644 system/media/bootanimation.zip
chmod: chmod 'system/media/bootanimation.zip' to 100644: Read-only file system

1|root@p1:/ # rm system/media/bootanimation.zip
rm system/media/bootanimation.zip
rm ro system/media/bootanimation.zip (y/N):y
y
rm: system/media/bootanimation.zip: Read-only file system

1|root@p1:/ # mount -o remount rw /system
mount -o remount rw /system
mount: Read-only file system

any idea ?

thanks & sorry for my frenchy english ;)

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