Boss Dr. Rhythm DR-770 Owner's Manual page 16

Restoring the Factory Settings (Factory Reset)
4.
Press [ENTER].
The display will ask "Sure?," asking you to confirm that you want to execute the Factory
Reset operation.
fig.01-07a
MODE
SONG
PATTERN
PAD
UTILITY
QUANTIZE
NEXT PTN
PART
If you decide not to execute Factory Reset, press [STOP/EXIT].
5.
Press [ENTER] once again.
The display will indicate "Done," indicating that Factory Reset has been completed.
It is also possible to restore only a portion of the data to the factory settings.
MEMO
Refer to "Restoring the factory settings" (p. 91).
16
FUNC
REAL INSERT
STEP COPY
EFFECTS DELETE
MIDI
BEAT
LENGTH
PATTERN