Thanks, seem to have got that sorted now.
Just need to get past the next section now.
I put my bootloader drive in and it stopped refreshing, but no sign of the device in the synology assistant.
Got another pendrive and reloaded the image. This time it stopped refreshing at the same point as expected but it showed up in the Synology assistant. Only issue was i'd forgotten to change the VID/PID details to match the pendrive so it wouldnt load the PAT file
Then got a third pendrive, set the VID/PIN details and serial no etc but am getting the same results as the first time where it's not showing up in the synology assistant.
I've also noticed that the unit is no longer being registered by my router. Could i have knackered something? I'm using a HP Microserver Gen 8