I got the bsod when trying to update from cata 12.6 to cata 12.8 on my amd 6770m, was this because I didn't have microsoft.net framework installed? I'm scared to try it again lol...
Device manager -> Display Adapters -> double click on the card -> update driver -> browse my computer for driver software -> let me pick from a list (yadda yadda) -> and search for the inf of the driver (when you install the driver, it extracts the package somewhere on your hdd, the default directory being C:\AMD... search for the inf subfolder, i had 3 files found, i selected one...cant remember which, it detected the driver and bypassed the infamous "BEST DRIVER ALREADY AVAILABLE" crap... hope this helps =)