I have a ThinkPad laptop E535 with CPU A10-4600m - Engineering sample - ZM232863C4451 (and this serial number is shown in BIOS and OS System information) . So i have two GPU in it : 7660g and 7670M. When i try to switch parameters in BIOS on "switchable graphics" my OS (Win10 x64) freezes after several minutes of work and CCC freezes too. After it the system crashes with BSOD (atikmdag.sys). I tried all versions of drivers, tried to replace atikmdag.sys in root system32. Please, can you help me solve this problem?