You might be able to do 1. if you have SSH access, and can invoke the firmware updater. I can’t remember exactly where it is; searching the forums might find it - ah: scroll down in the first post of this thread:
Recovery of you user data is relatively straightforward, but does involve opening the unit, putting the HDD in a machine running Linux (a LiveCD would do), or running an extfs driver on a PC. e.g.
Unbricking requires a bit more Linux skill, but it’s a pretty well documented process, e.g.
Once you’ve got your data back, and maybe got the MyCloud working again, start doing backups. Any HDD can fail, catastrophically, at any time. A backup regime protects you from that. Despite the name, the MyCloud is simply a NAS, and the basic MyCloud has no data redundancy; if it goes down, and your data is not held independently anywhere else, your data is lost.
