When the Factory Reset of the unit is requested?
Factory reset is requested when new software build installation goes wrong or some issue happens just after installation. Also if some installed plugin crashes, a factory reset could be useful to reset the entire system settings.
Note: the factory reset does not erase datas and it does not require new OS installation.
Factory reset erase system/network settings and the scanned music libraries (not files, once resetted you need to scan again your local music libraries from SOURCES MENU)