BBB mounted as RO !

I have followed this famous link :

I am able to boot the BBB using pre-compiled kernel but I found that the file-system has been mounted as Read Only and I am not able to read/write/mkdir/delete any thing.
Restarting the BBB doesnt solve this.
How can I fix this?
Thanks in advance

This is a Linux feature, and not unique to BBB.
When Linux sees something it does not like with respect to file system handling or I/O, it will convert that file system to RO, to prevent further damage.
Research “Linux making file system Read Only” or something similar.
You are likely violating something with respect to permissions, or making I/O errors.

To clear the “Read Only” protected status, you will need to do something like

mount -o remount /

Google is your friend.

— Graham