Vero 4K+ nat-rtsp dkms

I tested nat-rtsp and i need CONFIG_IP_NF_RAW to make nat-rtsp work:

iptables-legacy -A PREROUTING -t raw -p tcp --dport 554 -j CT --helper rtsp

also i need another configuration,
therefore i think the best is that i should create an enviroment to compile the kernel.

I don’t see logic asking for configuration by configuration.

When I have checked all the necessary configurations I will inform you and if you think it is convenient you will add them.

the next question is how to create an environment to compile aarm64 kernel for vero 4k+ from a debian 64b?, and the more important question is how to upgrade and downgrade kernel at vero device safely?

thanks in advance