Hi, thnx for that mate. It worked.
But, I was not able to rename the file using "Mi File Explorer" and I did find the option Mount W/R". I downloaded "ES Explorador de Archivos" mounted R/W and the work was done finally.
Yes, I'm new to Mi File Explorer, maybe I did something wrong.
okay here is the site from developer of mifile explorer. new version is in work and today ready for install. http://forum.xda-developers.com/showthread.php?t=1523691