Update - NETGEAR RNDP6620-100NAS - ReadyNAS Pro RNDP6620 Business Edition Software Manual

For example, selecting Japanese allows the ReadyNAS to support file names with Japanese
names in Windows Explorer.
It is best to select the appropriate language based on the region where the device will be
operated.
Note: This option does not affect the FrontView display. To change the
language in FrontView, adjust the browser language option.
If you want, select the Allow Unicode for user, group and share names check box for greater
flexibility in non-English speaking regions. This option, once selected, cannot be reversed.
Note: HTTP and WebDAV access do not work with Unicode user names.
Other restrictions might exist.
To convert the ReadyNAS character encoding specified in Unicode to the character encoding
used by your FTP client, select the Enable character encoding conversion for FTP clients
check box.

Update

See Updating ReadyNAS Firmware
ReadyNAS for Business RAIDiator 4.2.17
on page 120.
Managing Your ReadyNAS System
42