Hi, I found another one in non-free:
jessie-lts has amd64-microcode 3.20181128.1~deb8u1 but stretch has only 3.20160316.3 amd64-microcode | 2.20160316.1~deb8u1 | jessie/non-free | source, amd64, i386 amd64-microcode | 3.20160316.3 | stretch/non-free | source, amd64, i386 amd64-microcode | 3.20181128.1~bpo9+1 | stretch-backports/non-free | source, amd64, i386 amd64-microcode | 3.20181128.1~deb8u1 | jessie-security/non-free | source, amd64, i386 amd64-microcode | 3.20181128.1 | buster/non-free | source, amd64, i386 amd64-microcode | 3.20191218.1 | bullseye/non-free | source, amd64, i386 amd64-microcode | 3.20191218.1 | sid/non-free | source, amd64, i386 Andreas PS: udd does not know about elts packages, does it?