Please Read the Following
Relating to the barcode beginning in "P/N":
If your device's part number is either "M90AA004_RA, M90AA004_RC, M90AA004_RD, M90AB004_RD, or M90AC004_RD," you have a Secure device. Otherwise, your device is Unsecure.
Installing unsupported versions of Magic Leap OS can cause your device to fail to boot.
From The Lab, download the following OSes:
For Secure devices, install "B3E.220721.07-R.027_user_secure."
For Unsecure devices, install "B3E.220721.07-R.027_user."
This has been "resolved' by disallowing flashing over the command line and inputting stricter enforcement in the ML Hub's OS installer.