I bought new Fujitsu UH572M 13,3" / i5-3317U / 8GB / 500GB + 32GB SSD / HD4000 / Windows 8 I wanted to downgrade from Windows 8 to Windows 7. I cleaned up all partitions on diskpart. I created Win 7 USB. On diskpart I created GPT for my ssd disk and before I started installation I miss MSR, I choose NEXT and install Windows 7. After installation when I reboot Windows it says WARNING Bootable device not found. Continue When I click on Continue I have boot manu: 1. Windows boot manager 2. Drive0 HDD:WDC WD500LPVT-16G33T0 and I can not see my SSD drive. I've tried everything, have no more ideas
im just throwing this out there sorry if im wrong but could it be because you are using a GPT partition for Win 7? id make a bootable usb with minitool partition wizard and see if you can change it from GPT to MBR in there. just throwing out some ideas. hope it works.
You also could check your Bios options, Disable SecureBoot and if you have a Windows 8 features line in the Bios, select "other os". windsman.