On my Pi-4, I have 2020-05-27-raspios-buster-arm64.img
I have originally installed ver 3.8.1 of piaware and dump1090-fa by building packages from source code as given in the how-to linked below.
To upgrade, I repeated the process of building source code, but as the master baranch is now at ver 4.0, the built packes are version 4.0.
However I had to install two additional dependencies of dump1090-fa, which were not required for ver 3.8.1, and hence not included in the how-to linked below:
$ sudo apt install libhackrf-dev liblimesuite-dev
Howto Install Piaware 3.8.1 on 64 bit Raspberry Pi OS (Raspbian) / Pi4
