Good day colleagues! Please help! About 1 year ago I sold my client device DABONDA Miracle DBM-4000F. Yesterday he came to me with a problem: the device turns on but after switching on, the screen goes black and there is no record. When I bought these devices in Korea, my partners told me that they have only Korean menus. I said that I need a menu in Russian. They gave me a firmware. After the client brought me the box, I tried to reload the firmware. The firmware is loaded about 3-4 minutes. After downloading the firmware the device was activated for 1-2 seconds and then the screen again went black. It's cyclical, the device turns on for 1-2 seconds and then disconnects. If someone has a firmware for this model please help me. Thanks in advance!