I think I broke my EFI partition

[Ouhei]

I had a perfectly working dual boot system with El Capitan and Windows 10 installed on the same drive with Clover. I could boot either just fine and everything ran perfect. The other day I decided to upgrade to Sierra and as a result I've broken my system pretty good. I hope this is the right section to put this in, I'll do my best to summarize what's happened.

System Specs:
Motherboard: Gigabyte GA-H97N-WIFI
Processor: Core i5-4590
Graphics: GTX 970

What's happened:

• Updated Clover
• Updated to Sierra
• Had trouble getting Nvidia web drivers to work, accidentally broke something in my Clover config and couldn't boot into MacOS anymore.
• Dumbly tried to mount my EFI partition in Windows by unhiding it with command line (which didn't help) then setting it back to hidden. (I think this is where I broke things)
• Got a message "Reboot and Select proper Boot device or Insert Boot Media in selected Boot device and press a key" whenever I boot, can no longer get to clover.
• Made a bootable Sierra USB using the install guide which let me get to clover, boot into MacOS and I was able to fix my Clover Config to have working Nvidia Drivers.
• Ran MultiBeast in MacOS to try and fix the EFI partition (used UEFI boot method)

Current Status:

• I can boot with the USB stick, get into MacOS and it runs fine
• I cannot boot Windows at all
• I still get the "Reboot and Select proper Boot device or Insert Boot Media in selected Boot device and press a key" message when trying to boot without the USB
• When in MacOS (booted from USB stick), I can mount the EFI partition and make edits in CloverConfig without errors
• My Partition table seems weird, it's listed as FDisk_partition_scheme when the bootable USB is GUID
  

I have a feeling that the FDisk thing is causing it not to be a bootable drive. Does anyone know how I would go about changing it to GUID?

 

[vulgo]

You can try GPT fdisk