Dell Inspiron 15 (3521), 15R (5521) Dell Vostro 2521 COMPAL LA-9101P (VAW01) 2012-08-22 Rev 0.4 Schematic
How to unlock bios password for Dell Inspiron 15 3521 https://fixbios.com//index.php?threads/how-to-remove-bios-hard-drive-password-for-dell-inspiron-15-3521.43373/#post-55328