She couldn't return it. The BIOS (technically, the modern UEFI firmware) was locked. The laptop was a brick.
On some business laptops, you can use a Windows bootable USB with the manufacturer's own BIOS Configuration Utility (BCU) to clear settings if the firmware isn't locked down. I booted a Linux live USB, ran dmidecode to read the firmware version, then tried the vendor's clear command. The laptop refused. The admin had set "User + Admin" lock—the nuclear option. efi firmware password removal
I overwrote just that block with zeros using dd on the command line, then flashed the modified image back to the chip. She couldn't return it
We reassembled the laptop—heart pounding—and pressed the power button. On some business laptops, you can use a
Sarah was desperate. The laptop wasn't stolen—she had a receipt. So we tried three techniques, escalating carefully: