If the SD card data from a sensor is displaying strange symbols, it may be that the config.txt file is missing. This configuration contains essential information for the sensor that tells it how to log the data.
To correct this, create a text file on the SD card with the following information:
The title of the file should read exactly as follows:
config.txt
The text in the file should read exactly as follows:
115200,26,3,0,1,1,0
baud,escape,esc#,mode,verb,echo,ignoreRX