For a project I am using the lara-r211 4g modules. However after some time they stopped working. The modules would no longer reply to the AT commands when they were active
The first module stopped working after sending an at+usio command(which is an invalid command) and resetting the device. The V_int pin on the module still outputs 1.8V meaning the device is active, but the module is not responding.
The second module stopped working after start-up, making this module also not respond to the AT commands. However the V_int pin on this module showed 1.12V instead of 1.8V.
I have asked some question on the u-blox forum but they are not quite sure what the problem is, but it might have been that the module is bricked during the start up sequence. This could be fixed through reflashing the firmware, however i can’t find enough information or support for this. The tool they recommended was the easyflash tool, but this i couldn’t find or get through support.