M.2 Clone Drive - BIOS - No Bootable Devices

1. I've cloned this drive many times with no errors.  However, when I install into the laptop I get 'No bootable devices found'.

I have 

2. * changed from RAID to AHCI with the same result

3. * Secure Boot is enabled

4. I do have a 2nd HDD drive in the machine which is data only.

1. Is "Windows Boot Manager" still Boot-Priority #1 ?

2. You must leave that option as when clone was made (and laptop was still booting and working).

3. You can change as needed to get into Windows the first time.

4. Should probably be temporarily disconnected while doing this stuff with C-Drive.

The (self bootable) Macrium Rescue Flash-Drive was an option called "Fix Boot" that helps sometimes.

So, if "Cloning" doesn't work, you can always create a full Image-File (with Verify on) and Restore that (that's how I recommend doing it in the first place).