unable to chmod read-only file system
i've rooted my vodafone 858 but it didn't install super user although i can type `su` command in adb shell.

now i'm trying to delete files located in `/mnt/asec` (downloaded packages) due to low phone memory.

so i tried to do it but when i do the command `rm` for files located in there it tells me permission denied , so i entered super user mode and i tried `rm` it tells me `unable to chmod <path> read-only file system` so how can i get past the read only?
unable to chmod read-only file system
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i've rooted my vodafone 858 but it didn't install super user although i can type `su` command in adb shell.

now i'm trying to delete files located in `/mnt/asec` (downloaded packages) due to low phone memory.

so i tried to do it but when i do the command `rm` for files located in there it tells me permission denied , so i entered super user mode and i tried `rm` it tells me `unable to chmod <path> read-only file system` so how can i get past the read only?