Cannot remount system (read only) as read/write on my Android TV Box using the adb shell

Question

I am trying to change the access rights of the file system at root level (/) (or /system level) from read only to read/write on my Android TV Box using adb and the shell. My Android TV Box runs as Android 7.1.2

A mount command returns :

1|q201:/ $ mount
rootfs on / type rootfs (ro,seclabel)
...

The following command :

1|q201:/ $ mount -o rw,remount mtd:rootfs /

returns :

mount : '/' not in /proc/mounts

A cat /proc/mounts command returns :

q201:/ $ cat /proc/mounts
rootfs / rootfs ro,seclabel 0 0
...

The following command :

1|q201:/ $ mount -o rw,remount /

returns :

mount: 'rootfs' not user mountable in fstab

Starting adb at root level adb root does not change anything.

Could someone kindly help?

Answer 1

you cannot remount the rootfs in rw mode, but only the system partition.

to see what is mounted:

cat /proc/mounts

or the available partitions:

cat /proc/partitions

Answer 2

Device must be rooted!

su
mount -o rw,remount /