I did it!!!! After numerous hours of trying, It seems I finally solved the problem. Now I will go step by step, to guide you guys to victory against all odds.
1st step - You should have a clean boot. For this, you need to execute Run (windows+ r) and type msconfig.
when you got msconfig on your screen, you should go to the startup, select open task manager if available, then disable ALL. I mean ALL apps. then, go back to the msconfig, find services, click Hide all Microsoft services beneath the services, then press disable all. By this, you are disabling intel drivers etc. And I think this unblocks something prevents AMD software. Then reboot. Download your latest driver and upgrade. This worked for me.