You have the dual xdvd8183 and it is locked how do you reset it?

To reset a Dual XDVD8183 that is locked, first, disconnect the power supply by removing the car battery's negative terminal or unplugging the unit from the dashboard. Wait for about 5-10 minutes, then reconnect the power. If the unit still does not respond, press and hold the reset button located on the front panel or inside the small hole at the back of the unit using a paperclip. This should restore factory settings and unlock the device.