Upgrade template from joomla 2.5.2 to joomla 2.5.3

Hi!
I have installed today your template the_real_design, and when I tried to access the back-end (front-end worked OK) I received the message: "Username and password do not match or you do not have an account yet."
I thought that I was wrong when I set the user and password, so I un-install it, delete the database, and install the template again. Same problem. That's happened several times, until I received the security alert "[20120304] - Core - Password Change" from Joomla Security Strike Team.
I checked the joomla version used in "gk_the_real_design_quickstart_J!25.zip" and I saw that it is 2.5.1.
My question to you is when will you have a template version using Joomla 2.5.3, or how can I upgrade the Joomla version used in this template, without having access to back-end?

Thank you,
Mihail Berejan

You can upgrade template without any problems to 2.5.3 version, our quickstart include this Joomla! version. For problem with login/password, please try to restore this details via database modification (if you have access of course), please look here for more help >> http://docs.joomla.org/How_you_reset_an ... assword%3F