Areca 24/4 Internal/External Port Pcie 3.0 12 Gb/s SAS/SATA Raid Controller 2Gb Cache - Manual (Page 117)

DRIVER INSTALLATION
117
(1-4). In the Recovery app, choose Utilities > Startup Secu-
rity Utility .
(1-5). Select the system you want to use to set the security
policy and click “ Security Policy ”. If the disk is encrypt-
ed with FileVault, click Unlock, enter the password and
then click Unlock.