Android 2.3 : Read-Only file system stuck [closed]

Question

Hi. I have an LG-Optimus HUB E510 Android Device.

Two weeks ago I rooted my device to access internal storage and change some files (such as alarms, notifications, sounds, .etc).

Well I did it. But after re-storing factory settings, internal storage files became again read-only.

Then I tried adb-shell to change the privileges of folders and files with

chmod  777  "folder destination"

but the shell responded as

Unable to chmod system/media/audio/alarms: Read-only file system

Now I don't know what to do. So, I need your suggessions. Thank you.

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Pictures

This is the changing permission attempt from shell in ubuntu The files included with current permissions in eclipse DDMS perspective

Answer 1

Try to use one of the following ways:
mount -o rw,remount -t rootfs /system
or
mount -o rw,remount -t rootfs rootfs /system

You also can use it for any folder that you need even root (/)

Answer 2

You can also try this:

adb root
adb remount

and this will also mount /system