EFI missing

I have (had?) a perfectly working Hackintosh (clover boot) running on a Asrock MB with a Samsung 500Gb mSata drive. All of a sudden, the machine stopped booting. It no longer shows the EFI partition in the BIOS although the drive itself is still detected.

Any clue why this might happen and any hints on how to solve this ?

submitted by /u/moonshinesg
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