Yes, got the same problem when I updated it. I’m not an expert on these part, so may be the following question are idiot but …
Did you keep the reference to the respeaker repo ? “deb [arch=armhf] http://respeaker.seeed.io/deb stretch main”
To update the distribution, the kernel needs to be update to ? Is this kernel, 4.4 is compatible with debian buster ?