My Acer E5-571-52C8 turned very slow after a BIOS update. I updated to v1.32. It seems, like it only recognizes 1 processor instead of 4. I used to be able to chose rebooting with 2 processors instead of 1 (using msconfig, advanced options). Right now I can select only 1 processor.
Downgrading to previous BIOS versions is not possible. So what is the solution?