There are other issues that the wlan0 cannot use monitor mode.
That need to be fix.
─[pi@parrot]─[~]
└──╼ $sudo airmon-ng start wlan0
Found 2 processes that could cause trouble.
Kill them using ‘airmon-ng check kill’ before putting
the card in monitor mode, they will interfere by changing channels
and sometimes putting the interface back in managed mode
Hello. Monitor mode doesn’t seem to be supported by default on the Raspberry Pi. You should buy a wifi adapter that supports it. However, I’ve read around that someone has enabled it by applying a specific patch. I’ll check but make no guarantees for now.
i have the alfa network wifi adapter and it does not seems to work at all on parrot security os for monitor mode for the raspberry pi 4. But not with Kali. Even though the alfa network does support for monitor mode.
I have to install the packages sudo apt install firmware-misc-nonfree for the alfa-network awus036acm to work with monitpr mode. As for the Realtek wifi adapter RTL8812Au with sudo apt install realtek-rtl88xxau-dkms. But the parrot security os need the packages for nexmon to patch the broadcom wifi chipset to get it to work like kali. Then it can only work with monitor mode.