The command 'adb root' works, but 'adb remount' results in "Operation not permitted" message I'm trying to remount /system to copy some files to it. I tried the following with adb:

adb root
adb remount


The first command works fine (because my phone is rooted), but the second tells me that the operation is not permitted. If I open an adb shell and run su I can access the system folder without problems.

What could be the problem?
Some phones just don't allow remounting via adb remount.

Mount as RW:

adb shell su -c "mount -o rw,remount,rw /system"


Mount as RO:

adb shell su -c "mount -o ro,remount,ro /system"


Also you could use the Adbd Insecure app, but it's not free.