Bigger drives for 4TB My Cloud Mirror Personale NAS

I have the Western Digital WDBZVM0040JWT-NESN 4TB My Cloud Mirror Personal Network Attached Storage. Is it possible to replace the hard drives with bigger once? Replace the two 2TB drives with two 4 TB drives?

While some Users have reported success, it may likely result in a new RAID volume. There are no official instructions available able to provide a device-specific guide for the unit.