1. Find the serial number of the device, which can usually be found on the device label or on the back of the device.
2. Convert the letters and numbers in the serial number into the corresponding ASCII code 16.
3. Splicing the converted ASCII code to get a long 16 hexadecimal string.
4 Take this string as input, encrypt it with MD5 algorithm, and use the first 8 digits of MD5 encryption result as the background password of DR.