如何升级COFDM中继或网口收发模块?
- Prepare a formatted FAT32 Format Micro SD card.

2. Ask we offer you the correct version upgrade firmware.
https://drive.google.com/file/d/1BztD-7mMy1N0WT0gfG2-fTO-7WtKTte9/view?usp=sharing
3. Unzip the “update_image_xx_yy.zip” file and copy it to the root directory of the Micro SD card. Be careful to keep the directory structure unchanged (Micro SD卡根目录下有一个flash文件夹, which contains app and rootfs folders):

4. Insert the Micro SD card into board, 通电等待板上红灯闪烁, 表明升级成功:

注意:
通常情况下, the update will be completed within 30 seconds after power-on (红灯闪烁). 如果开机后红灯长时间不闪烁, please check the connection of the Micro SD and try again.
Need details of COFDM relay or network port transceiver module? 请检查以下链接. 维肯1816
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