qnap ts-870 pro bios update

I can’t find for the life of it on the download page any bios update files at all. Am i missing something? I have the qnap ts-870 pro. trying to see if i can upgrade it to 32gb or ram also. i’ve heard some people have success with it. but yeah is the bios not upgradable that’s why i can’t find anything?

If people had success with that processor (intel specs say 32GB max)…did they with this NAS and if so…ask those guys for the BIOS