J-Tech Digital JTD-669 - Web Interface Firmware Update; Web Upgrade via USB; Upgrade Steps and Notes

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Web Upgrade
Connect unit to PC via USB cable from micro-USB port.
Open Application ”UART_ISP_V1.6.exe” and select correct USB/COM port
Set Baud Rate: 115200 | Type in “F0” in PORT | Select PATH and then click
UPDATA to apply update.