I believe the company is dead, no updates since many years, one of the reasons I replaced the Thecus with a current Synology, primary because of active backup for business and for O365.
I installed this on a Thecus N5810, it worked good, but never put it into production, bought a Synology DS1522+.
Anyone remember Thecus? Stable hardware with nice buildin UPS and the most awful software and stability you can get.