08-29-2020, 02:48 PM
The Active flag status of a partition should not affect UEFI-booting.
It is possible that some UEFI BIOSes do not like an 'EF' type partition type on an MBR disk. To test this you should change the EF byte to 0C.
It is possible that some UEFI BIOSes do not like an 'EF' type partition type on an MBR disk. To test this you should change the EF byte to 0C.