Check your current BIOS version
Go to Dell Support: https://www.dell.com/support
Enter your Dell 15 7560 service tag or select the model
Open the Drivers & Downloads section
Select BIOS under category
Download the latest BIOS update file
Plug in the AC adapter
Make sure the battery is charged
Close all open programs
Run the downloaded BIOS update file as administrator
Follow the on-screen prompts
Do not turn off the laptop during the update
Wait for the system to restart and finish updating
Verify the BIOS version after reboot
If needed, update other firmware and drivers from Dell Support
If the update fails, retry from Windows or use the BIOS recovery method from Dell support instructions