Updated Synology NAS from a very old version. Had to apply updates in a specific order for the DS210j that I have:
3.0-1534
3.1-1594
3.2-1922
4.0-2228
4.1-2668
4.2-3211
4.3-3827
5.0-4493
Updates were obtained from http://ukdl.synology.com/download/DSM/