Clip an external hardware programmer (such as the CH341A programmer) onto the chip pins.
You may find older guides suggesting you remove the CMOS battery (a coin-cell battery on the motherboard) to reset the password.
The 5520 has a known firmware bug where USB-C docks interfere with keyboard input on the password screen. Disconnect all docks and USB hubs. Use the built-in laptop keyboard only. dell latitude 5520 bios password reset
The process for resetting a BIOS password on a Dell Latitude 5520 Go to product viewer dialog for this item.
: Enter an incorrect password three to five times until a system number or hash code is displayed. Clip an external hardware programmer (such as the
Once you successfully regain access to your Dell Latitude 5520 BIOS, take these steps immediately to ensure future stability:
On modern laptops like the 5520, removing the CMOS battery might only reset the system clock and NVRAM settings, but it is often the first troubleshooting step for clearing basic BIOS hangs. How to Reset, Remove, or Recover BIOS Passwords | Dell US Disconnect all docks and USB hubs
Remove the bottom cover, battery, and cooling assembly to expose the motherboard.
The time and date reset, but the BIOS password likely remains.
: When back at the password prompt on your Latitude 5520, type the release code carefully. You must hold the Ctrl key and press Enter to submit the master code; clicking "OK" with the mouse may not work. Hardware Considerations