MikeMecanic said: View Post
Flappy is 4 years old and should have Fast Boot. Mine is hidden in Security parameters.

This link shows how to access-enable Fast Boot. It was probably reset by the BIOS update

Dell Inspiron Bios Issue - setup - Laptop Tech Support

To enable Fast Boot:

1. When the laptop boots up, enter the BIOS setup by pressing "F2".
2. Now go to the "Boot Configuration menu".
3. Choose the "Enable Fast Boot".
4. Press F10 to save the changes and exit.

F3 on startup seems also responsible for enabling-disabling it.
There is no Fastboot option anywhere in the Dell Inspiron 7537 BIOS!