Sorry We missed this.
Have you tried unverified bios uploads?
I found 1 but you may want to get a gpu-z screenshot of your cards current Device ID, and Subsystem...
Only thing I can suggest is using a webbrowser like puffin.
On some sites there is an option to use desktop site but that requires a cookie, when that gets deleted you have to start over.
What Android version is it using? Is it touchwiz for interface still?