Kernel headers for current kernel version and bcm4360 wifi/bluetooth driver

[maximtitovich]

I want to install kernel headers to then install broadcom 4360 wifi drivers on current kernel version.
uname -r gives 6.1.0-20-amd64
When I try to install headers with apt install linux-headers-6.1.0-20-amd64 it gives an error that no package found.
If I install generic ones, it installs the latest version for wrong kernel version.
The question is: how do I update the kernel or how to install and find the right headers for current one?
I tried installing different linux-image packages with apt install linux-image-generic, but new kernel version does not load when rebooting.
Maybe this is a bit unrelated to the umbrel itself, but I'm just stuck now with this problem.