Serialize two dongles as follows (8-digit):
Dongle for 1090 Mhz Serial#: 00001090
Dongle for 978 Mhz Serial # : 00000978
Please see this guide:
-
if you are using Piaware SD card image:
How to Install and Configure Piaware 5.0 SD card image - Quickstart Guide
See items 5 & 6 -
If you are using Raspbian image with package install of piaware, dump1090-fa, and dump978-fa:
[Package Install] How to Install and Configure Piaware on Raspberry Pi OS Image / RPi
See items 4 & 6