In case anyone has the same problem in the future about Android phone not having read/write access to certain system folders (like using link2SD that has mount script problem), this is a quick fix
1. Install ADB with Fastboot download here.
2. Once installed, open a CMD box.
3. Type the following (one command per line)
mount -o rw,remount /system
Both adb remount and adb root don’t work on a production build without altering ro.secure, but you can still remount /system by opening a shell, asking for root permissions and typing the mount command just as the steps provided above.