Can you attach the project? What is the settings for this particular charactetristic?
the serial number is defined in main.c line 538 and set with CyBle_DissSetCharacteristicValue() in line 559. But the serial number is blank on the device information service page shown with CySmart. See attached empty serial number.png.
The firmware value is blank too, even it is set to 1.00 on the Profiles device information Firmware Revision String.
Attaching the project.