Arcade machines employ multiple layers of security to protect their firmware from unauthorized modifications. One common method is hardware-based protection, such as custom chips or locked-down circuit boards that prevent tampering. Manufacturers also use encryption to secure firmware updates, ensuring only authenticated code can be installed. Secure boot processes verify the integrity of the firmware before execution, blocking any altered or malicious code. Additionally, physical security measures like tamper-evident seals and proprietary connectors deter hardware hacking. Regular updates and digital signatures further enhance protection, making it extremely difficult for unauthorized changes to go undetected. These combined measures help maintain the integrity and performance of arcade machines in public gaming environments.