Use the physical buttons on the bottom left to turn the unit on/off and the rotary knob or +/- buttons for volume.
This process involves entering the unit's to manually overwrite files. Pioneer Carrozzeria Avic-mrz09 English Manual Upd - Pioneer Carrozzeria Avic-mrz09 English Manual UPD
The MRZ09 supports DVD, CD, SD cards, USB, and Bluetooth Audio. Changing the Language to English Use the physical buttons on the bottom left