针对航天航空密封舱设备开舱维护成本高、周期长的难题，本文提出一种高可靠的OTA远程升级方案。该方案基于双镜像备份与轮换机制，集成完整性校验、状态机管理与自适应网络协议等关键技术，确保升级过程安全可靠。系统支持最大16MB固件升级，当升级失败时可自动回退至稳定版本。通过理论分析和实验验证，误检概率低于9.32×10-10，Flash寿命提升约2倍；在密封舱环境下升级成功率达99.9%，故障恢复率100%。与传统开舱方式相比，维护时间从数小时缩短至约1分钟，维护成本降低90%以上，有效解决了密封舱设备的维护痛点。

To address the high cost and extended downtime of manual maintenance for aerospace sealed-cabin equipment, this paper proposes a reliable over-the-air (OTA) upgrade solution. The method adopts a dual-image backup mechanism with integrity verification and adaptive network protocols, enabling secure firmware updates of up to 16 MB and automatic rollback in case of failure. Experimental results show a misdetection probability below 9.32×10-10, approximately doubles the Flash lifespan, a 99.9% upgrade success rate, and 100% fault recovery. Compared to traditional manual methods, this approach reduces maintenance time from hours to about one minute and cuts costs by over 90%, effectively resolving key maintenance challenges.