i have a magento 2.0.4 website working on a server. As I want to upgrade it to 2.1.0, I did a backup and installed it on my local server (W10 with xampp & composer), localhost (127.0.0.1).
I did clean the cache and removed everything, except .htaccess file from pub/static folder, run the command on Magento root :
php bin/magento setup:static-content:deploy

I opened up app/etc/di.xml find the path “Magento\Framework\App\View\Asset\MaterializationStrategy\Symlink” and replaced to “Magento\Framework\App\View\Asset\MaterializationStrategy\Copy”

the website frontend is good but not the admin backend, it shows just white box in admin and no fields to login in to admin as well. There's no error in the console dev.

I checked as well, my account is not locked.

I did try to install a new fresh magento2 version with xampp and it's working... But not my website version

Do you have any idea how to make the admin work again ?