I purchased this board in your company web site. when i reveived it , it can not work correctly after I install the battery. only the red led 2 is lighted and no datas was writed in the sd card. what is the problem ?
I refer to the following website, but the problem still cannot be solved
I also changed a different SD card and the device still cannot record data. I follow the prompts to update the firmware, but the download error. How to solve?