LevelOne WBR-3402TX - Manual (Page 146)

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4.If you can find one device and unreachable. You must setup the same
submask, For example configure the PC IP address to 192.168.12.xxx.
5. Click “Upgrade Button” and to upgrade the firmware smoothly.
6.If successfully, please use “Reset Button” reset to default the router.
If failed, the program will ask to redo again from Step 2.