Firmware Update 
SM  5-52  D245/D246/D247 
and the power is switched ON again, normal operation cannot be guaranteed. 
  To guarantee operation, an update error continues to be displayed until update is 
successful. 
  In this case, insert the SD card again, switch the power ON, and continue download of 
firmware from the SD card automatically. 
5.6.4  HANDLING FIRMWARE UPDATE ERRORS 
If an error occurs, the panel will display an error message. 
There are 4 different messages as shown below. 
 
The following are the possible error conditions for each of the 4 error messages: 
 
Error Message  Error Situations 
SD Card not supported  1. SD card not inserted 
2. Bad card 
3. SD card format 
4. SD3.0 card 
File not exists  1. FW file not in D245/D245***.brn 
Invalid file format  1. FW file not correct 
Update Failed  1. MPU defective