C:\Program Files\Android\android-sdk\platform-tools>adb devices
List of devices attached
mio-device device
C:\Program Files\Android\android-sdk\platform-tools>adb shell mount -o rw,remoun
t mio-device /system
C:\Program Files\Android\android-sdk\platform-tools>adb push flash_image \system\bin
failed to copy 'flash_image' to '\system\bin': Read-only file system
C:\Program Files\Android\android-sdk\platform-tools>adb shell mount -o rw,remount mio-device /system/bin
mount: Invalid argument
C:\Program Files\Android\android-sdk\platform-tools>adb shell mount -o rw,remount /system/bin
Usage: mount [-r] [-w] [-o options] [-t type] device directory
C:\Program Files\Android\android-sdk\platform-tools>adb shell mount -o rw,remount /system/bin/
Usage: mount [-r] [-w] [-o options] [-t type] device directory