Hello,
refer to the product documentation:
A communication device is composed of multiple embedded computer systems. The software of the device may be attacked by viruses, or maybe tampered with or attacked by Trojan horses by means of vulnerabilities. Once the system is attacked, the attacker can intercept data by modifying configurations or capturing packets.
Run set flash-lock command to enable the secure startup function to prohibit system startup when the system software is damaged, improving system security and reliability.