Currently, various embedded products have become abundant and diverse, transforming our lifestyle. As the functionality of embedded products increases, ensuring that users can safely and smoothly upgrade their purchased products without encountering unexpected power loss during the process, which could lead to product malfunctions, has become a significant concern. This issue requires embedded product designers to incorporate a "safe mode" into their designs from the outset. Here, we will use an example of an embedded Linux-based network player to illustrate the design and implementation of a safe mode. Through this article, we can gain insight into the technical considerations and implementation details required when designing a practical embedded system.