There is no universal cadence, but a sensible rule of thumb is to check for updates every three to six months. ZTE does not follow a fixed schedule; instead, updates are released as needed in response to discovered bugs or vulnerabilities. However, follow these triggers: (1) When you learn of a major security advisory affecting routers (e.g., the VPNFilter malware outbreak or a specific ZTE CVE), update immediately. (2) After changing ISPs or upgrading your broadband plan, as a newer firmware may better handle higher speeds. (3) If you experience persistent, unexplained performance issues. (4) At least once a year as a routine health check.