Several years ago I snagged  the Gen8 and discovered xpenology. I dont really understand what I am doing but followed a tutorial and successfully got Bootloader running on micro SD inside the box, first go. Worked very well. Installed Plex to manage media and had DSM 5.2-5644.5 running. (DS3615xs). I started to get messages about DSM being out of date but ignored it. I really didn't want to change something that was working especially as i don't know what I am doing.  Recently though,