Explore 20 methods for bypassing secure boot systems in this comprehensive conference talk. Delve into secure boot theory and examples before examining various attack vectors, including debug access, service functionality exploits, and UART vulnerabilities. Learn about timing attacks, glitch sensitivity, and electromagnetic fault injection techniques. Investigate design flaws, firmware upgrade vulnerabilities, and cryptographic weaknesses. Gain insights into key management issues and weak signing methods. Conclude with valuable parting thoughts on improving secure boot implementations and defending against potential exploits.