That happened to many users of this terrible product. Every now and then a firmware upgrade breaks it and up until now I haven‘t seen anybody who fixed it.
I had the same problem a year ago. I restored my data and bought a Synology product which is way better.
I hope you‘ll get your data back.
Oh and if you contact support they‘ll probably tell the same as to everybody: Hardware is broken. They also told me that, but ignore it, they simply can‘t or don‘t want to help
