First, do you have admin rights on the system ?
If Yes, First open an elevated command prompt and give the EFI partition a drive letter, you can do it with mountvol or with diskpart.
I am doing with diskpart,
In the following example the EFI partition is on disk 0, partition 1 and will be assigned to letter b:
select disk 0
select partition 1
Now kill the File Explorer process and start it with administrative privileges:
taskkill /im explorer.exe /f
Now you can access the EFI partition with File Explorer.
Note that the EFI partition is a FAT32 file system partition. FAT partitions don't have the Security tab, this is a NTFS feature only.
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