Hello, I have a DS411slim with a blicking blue light. The first symptoms were that the NAS would become unresponsive. At first it happened after a few weeks of normale activity. A reboot would then fix it after unpluging the Synology. It then happened more and more, till the DS411slim won't boot anymore, stuck in blicking blue light of death. Gladly, by using a Raspberry Pi, I was able toby P'titLu - uBoot