Cannot find any hard drive after Vaio BIOS upgrade

So the thing is that I just upgraded BIOS version with official Sony Vaio Tool, but after it got upgraded the laptop cannot find any hard drive.

• I'm using a Sony Vaio SVF1531A4E with the main HDD and secondary SSD in optical bay (using adapter).
• Windows was installed on SSD drive before the errror.
• Initially it returned me error 0xc0000185 with missing or corrupted files: winload.efi , \Windows\system32\config\system

I tried resetting EFI FAT32 partition via Recovery Console, reinstalling in SSD, trying to install Linux and pressing power button for 30s and stuff, but none of them worked.

Currently, both disks are completely wiped and I'm installing Windows 8 in main HDD and it seems to work but it's going really slow. If this doesn't work, what should I do?