How to verify which EFI firmware is in use.
Known to apply to the following Sophos product(s) and version(s)
Sophos SafeGuard Disk Encryption for Mac
What To Do
Use the following terminal command to verify the EFI firmware:
"ioreg -l -p IODeviceTree | grep firmware-abi"
The return value should be "firmware-abi" = <"EFI64"> or "firmware-abi" = <"EFI32">
EFI32 is supported as of SafeGuard Disk Encrytion for Mac 5.50.1