Firmware Update for GNSS EC200U-CN

Hello, I am using EC200U-CNAP-N05-SGNSA.I tried to update the Firmware for this module. I followed the correct process. I selected AT PORT in COM Ports for downloading the firmware and I am using QFlashV6.2 tool to download the firmware.

When I tried to download the firmware I got HOST_FDL_OFFLINE and after sometime I got UART_SEND_ERROR.

In some cases I got error like AT_PORT_NOT_EXIST[PASS].
AT PORT is available and not occupied by any other device.
Device is also not powered off during the process.

May I know the reason for this.
Please Send me the latest version of QFlash tool.
Thanks in advance.

My Email : amarnath.m@digitalshark.in