Hi Mopox and Martin, I'm getting the same behaviour but from an upgrade from jessie to stretch. I've added some info to https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=890262#51 but this might be a different problem. Funnily enough while setting up a tftp server to try to boot from the network I found some old kernel & initrd files in the existing tftp server on my machine, these are from early 2017 and I guess they are jessie installers. Try those out doesn't get me into the installer (which I want to use to revert to the old 3.16 kernel) I get the following log https://paste.debian.net/1011554/ So I tried with the initrd and kernel from the stretch installer from http://ftp.debian.org/debian/dists/stretch/main/installer-armel/current/images/orion5x/network-console/qnap/ts-109/ I tried with the padding for the kernel as suggested in http://www.cyrius.com/debian/orion/qnap/ts-109/recovery/ (dd if=kernel of=kernel.pad ibs=2097152 conv=sync) but that is obviously not useful. In the end, I got it to boot to installer with http://ftp.debian.org/debian/dists/jessie/main/installer-armel/current/images/orion5x/network-console/qnap/ts-109/ I now have to find out how to do the equivalent of grub-upgrade on the previous kernel. But while I'm in this state, I can help out debug this problem. Arthur
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