I can't reach mycloud in any way

If you are certain you updated to OS5 v5.x firmware then see, and search through, the OS5 subforum for similar posts about continue front blue flashing LED. For example someone just posted the following in the OS5 My Cloud subforum:

And this discussion:

Use the forum search feature (magnifying glass icon top right) to search through the OS5 subforum(s) to find similar posts and discussions on the front blue flashing LED issue. It comes up from time to time.