Yes, I have disabled C1E in BIOS.
I have written the following boot loaders to USB, taking from the original IMG files, so I am starting from new each time. All have the same effect, the machine boots from USB but freezes.
Jun's Loader v1.03b DS3615xs [Synoboot_3615]
Jun's Loader v1.03b DS3617xs [Synoboot_3617]
Jun's Loader v1.04b DS918+ [Synoboot-ds918]
The only thing I am changing in the grub.cfg is the VID, PID, MAC and timeout.
I am checking my router logs to see the DHCP lease request, I know the MAC, but its not doing it, the NIC is not initializing and device is not accessing the LAN at all, hence freezing.
Any ideas what I could try?
This is SOOO frustrating because I had DSM on this machine a few years ago......