EPI 7.5 Upgrade | Admin/Edit Mode not accessible

Hi,

We are migrating the site from CMS 6 to 9. We are going step by step.Till 7.0 all ok.

After upgarding the to 7.5 by-passing all the code and tried to access admin mode, but it is not accessible.

When we enter the url "epi/cms" it is rediercting to home page.

I have give all the access from config location path.

Also removed all the unused DLLs.

What I am missing here? Please help.

Thanks in advance.

//Abhishek