I disconnected all HD's from my NAS (DSM DS3617xs and installed an empty disk without partitions. Then booted with Tynicore in legacy mode, everything was set according to the specifications DS3617xs and generated with broadwell. So that no error message came up when generating, I had to run the build with sudo rprloader. sh... start!
Then an MB reset, then I can choose: a Par Legaymode and 3 partitions UEFI. Attempting to boot in legacy mode comes up with the terminal message "grub rescu".
If I boot the first partition in UEFImode, the 3 modes for the Synology are displayed sowit ok. Now when I select the first line I get the error message "kernel dose't support EFI" I don't understand the connection who can help me?