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The user must contact Dell Support and provide this code along with proof of ownership. Dell then provides a one-time "master" or "release" code to unlock the system.
Comprehensive Guide to Dell Latitude 5520 BIOS Password Reset dell latitude 5520 bios password reset
Update your BIOS firmware to the latest version via the Dell Drivers & Downloads page to ensure all security patches are active. If you are stuck on a specific step, please let me know: The user must contact Dell Support and provide
Unplug the AC adapter and all external peripherals. If you are stuck on a specific step,
Enter the wrong password 3 times until a locked screen appears with a System Number Service Tag (e.g., -8FC8). Dell Technical Support with proof of ownership. They will provide a unique Master Release Code . Type this code and press Ctrl + Enter (not just Enter) to unlock the system. Third-Party Generator (DIY): Service Tag displayed on the locked screen (e.g., FJ64HL3-8FC8 Visit a site like BIOS-PW.org on another device. Enter your system number to get a recovery code. On your Latitude 5520, type the code and press Ctrl + Enter Warning: Hardware Flashing
Use a flathead screwdriver or a metal paperclip to touch both pads simultaneously. Hold this contact for 20–30 seconds. This shorts the circuit and drains residual power keeping the CMOS volatile memory active. Plug the CMOS battery and main laptop battery back in.