Hey @PiKaBZH,
Welcome to the Hailo Community!
You’ll need to completely remove the 4.20 driver and get 4.21 installed for that to work properly. Here’s the cleanest way to do a full removal:
First, let’s purge all the Hailo packages:
sudo apt purge hailo-all hailort hailofw hailo-tappas-core hailort-pcie-driver
Next, we need to clean out those kernel modules: This will find and remove all the Hailo kernel modules from your system:
sudo find /lib/modules -type f \( -name 'hailo*.ko' -o -name 'hailo*.ko.xz' \) -print -delete
Finally, let’s clean up any leftover directories:
sudo find /lib/modules -type d -name 'hailo' -print -exec rm -rf {} +
Once you’ve run through these steps, you should have a clean slate to install 4.21, which should get Frigate up and running. Let me know if you hit any snags during the process!