Trace databases are used to decode trace data and are maintained by Nordic Semiconductor. Databases are made for each version of the modem firmware.
By default, trace infers the path to the default trace database from the location of your nRF Util installation.
If you want to use a different trace database, you can pass --database-config <PATH> to the command line.
The following example command uses the trace database custom-trace-db.tar.gz for processing input_raw.bin:
nrfutil trace lte --input-file input_raw.bin --database-config custom-trace-db.tar.gz --output-pcapng output.pcapng