In theory, it is possible to modify device firmware to achieve remote control or steal sensitive information, and there have been related cases and research. However, the following points should be noted: 1. The role of firmware: Firmware is the underlying software running in the device, which is responsible for directly interacting with the hardware and controlling the device functions. If the firmware is maliciously modified, remote control functions or backdoors may be embedded, allowing attackers to gain control of the device or steal data without being noticed. 2. Difficulty of attack: Modification of device firmware usually requires certain conditions, such as: a. The existence of exploitable vulnerabilities that allow unauthorized writing or updating of firmware; b. The attacker may need physical access to the device or exploit weaknesses in the supply chain; c. If the device security mechanism (such as digital signature, cryptographic verification, etc.) is not strictly implemented, it is more vulnerable to attack. 3. Security protection: In order to prevent such risks, device manufacturers usually take multiple security measures, such as encryption and digital signature of firmware, integrity verification at startup, and restriction of remote firmware update permissions. Once these protection measures are in place, attackers need to overcome higher technical barriers. 4. Actual cases: In some IoT devices, routers, and other embedded systems, firmware vulnerabilities or malicious code have been found, allowing attackers to gain remote control capabilities or steal sensitive information. Most of these cases have attracted the attention of manufacturers and the security community and promoted the improvement of security reinforcement measures. In short, as the key software for controlling hardware, the security of firmware is directly related to the overall security of the device. Although it is technically feasible to modify the firmware to achieve remote control or steal information, such behavior usually involves unauthorized and illegal operations, which will have serious impacts on society and others, so it should never be attempted. Research on related risks and protective measures is more to improve the security of the system and respond to high-risk threats that may arise in the future.