hiseeu nvr boot problem

hi everybody please help me my dvr ids7208huhim1/s is dead during update electricity was cut off and update incomplete so the dvr not looading and give sound beep my device no rs232 port i need how connect to white 4-pin 1.5mm and what equipment(connector ) needed ?? and how ??? is there any...

I have this card, I emailed the company and asked for firmware, they were not interested. The device stays on the boot screen and restarts after 2-3 minutes. I can't find a working dump file or suitable firmware.