Shut down the laptop, replace the jumper cap onto the PSWD pins, and reassemble the machine. Method 3: Removing the CMOS Battery
Search for a 2-pin connector labeled PSWD or PASSWORD near the CMOS battery (small coin-cell battery). dell latitude 5520 bios password reset
, the BIOS (specifically the UEFI interface) provides two primary types of passwords: Shut down the laptop, replace the jumper cap