offset 0x1FFFF (2MB ROM) – modify so total sum of all bytes modulo 0x100 = 0. End of paper.

[Your Name] Date: [Current Date] Subject: Firmware Reverse Engineering / Hardware Modification 1. Abstract Lenovo, like many OEMs, implements a BIOS-level whitelist in many of its consumer laptops, including the Lenovo G570. This whitelist restricts the system from booting if an unauthorized (non-Lenovo certified) PCIe or mini-PCIe device—such as a Wi-Fi card, WWAN card, or SSD adapter—is installed. This paper analyzes the technical basis of this restriction, outlines the risks involved, and provides a step-by-step methodology to remove the whitelist by modifying the system’s SPI flash BIOS image. The procedure described is for educational and advanced repair purposes only. 2. Introduction The Lenovo G570 is a legacy Sandy Bridge platform laptop (circa 2011) valued by enthusiasts for its durability and upgradeability. However, its BIOS (InsydeH2O) contains a hardware whitelist (often via an ACPI or PCIe vendor/device ID check ). Installing a third-party Wi-Fi 6 card or a different Bluetooth module triggers Error 104: “Unauthorized wireless card is plugged in. Power off and remove it.”

Removal of PCIe Hardware Whitelist Restrictions in Lenovo G570 Notebook BIOS: A Technical Analysis and Procedural Guide