If it is connected to ardunio, please use the ino in the folder to test.

1. The files in the TF card should be cleared first. The format is: FAT32


2. Copy the attachment (the name and suffix cannot be changed) to the card, dont change the name, dont put it in the subdirectory, put it in the root directory


3. Plug in the TF card and power on, and you will hear a beep, indicating that the upgrade is complete


4. Delete the upgrade file in the card and put back the previous track


If it is connected to ardunio, please use the ino in the folder to test