Im using Win7 pro and theres a warning not to update to new 8.1 Bios when using 7/vista. So theres that.
It originally came with 8.1 but i took out that HDD and added and mSSD and clean copy of 7 pro (which its update is for the regualr SSD not the mS...
It originally came with 8.1 but i took out that HDD and added and mSSD and clean copy of 7 pro (which its update is for the regualr SSD not the mS...