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Thank you very much for your quick response, I haven't been able to get connected at all with UART when turning on the NVR once UART is connected to TTL device the the serial monitor I only get error device can not connected and drop the serial connection with the UART adapter However when I...

Good Morning, reading your posts about your nvr, I found myself in the same boat with NVR4-7400 The GA3.1 firmware file you have attached is also the same firemware file for my nvr i see that you were able to connect via uart were you able to reflash from there also? As my nvr will not find...