If you have any issue to access the OpenLinux terminal (if you are stuck in a bootloop for example) you can open the serial interface (ttyUSB1) before power on the module, and so power on while pressing the ESC button. Now swap the USB cable from USB-To-Serial port to USB-to-USB port and you will able to use fastboot normally as the same after send adb shell sys_reboot bootloader Plug the adapter in your PC, run lsusb in terminal and check the identified driver name: lsusb What really matters is the internal ethernet chipset in your adapter, so you need to check it to get the right driver. The brand name and model doesn't guarantee that this is the same driver name for the device. You need to identify the correct USB driver for your USB to ETH adapter. But you can use any other converter just swapping the driver configuration in a few steps forward. *I'm using an HP DHC-CT101 Adapter because reliability and ease to be found at any webstore or physical store (brazilian market for my case). Linux Operating System (can be a virtual machine).NL668-LA Module (or any NL668 series module).

So, if you didn't setup it yet, you can access the documentation on this link:

This documentation assumes that you already has an Fibocom's OpenLinux SDK done setup and you already made your first Hello World app. The main advantage of this process is because the OpenLinux can dismiss the necessity to use an external MCU or MPU, so you can use the NL668 as an Standalone solution for your project. This means that you can just plug the USB/ETH adapter on the OTG port and connect and Ethernet Cable to use the NL668 as an router to provide internet access to any device. The Networx® RJ45 Loop back tester will negate the necessity to carry a bulky network hub around.This documentation has the objective to teach how to use an USB to Ethernet adapter on NL688-LA dev-board using Open Linux. These Loop back testers will make the life of a network administrator really easy. If the link LED on your switch is active, then that means that the connection is operating perfectly. All you have to do is simply plug the Networx® Gigabit RJ45 loopback tester into the jack that you want to test or the one you are suspicious about. It looks like a simple plug at first glance but the compact, rugged design makes it highly portable and usable in the tightest corners. A Gigabit RJ45 Loopback Tester is an exceedingly user friendly cable tester.

Usb loopback cable