If the Xiaomi Portable Photo Printer 1S shuts down unexpectedly during a firmware upgrade, please refer to the following steps:
1. The printer will resume normal operation after restarting. Once restarted, you can proceed by re-running the firmware update process. This can allow the update to complete successfully;
2. Ensure that the device has enough battery before the firmware upgrade, as low battery levels can sometimes interrupt the process;
3. If the problem continues after multiple attempts, please contact Xiaomi support for further assistance.