@FM1h Once it was shutdown due to the low battery, it can be powered on as long as the power supply plugged into the USB port. While to make it work, like connect to its wifi network, we need press...

@aismike The M7350 cannot run without the internal battery; There is an USB cable included on the package, you can use a charger to to power it on. The charger will adjust the voltage automatically...

@Router.1 Is the sim card detected by the M7350? If it was deteced but no IP address, you can try to create the profile manually. Or you can follow the instruction below to do some troubleshooting....

@grt You can try to degrade the firmware to have a try. The firmware which is older than the current one is optional. https://www.tp-link.com/support/download/tl-mr6400/#Firmware If still the same,...

@JoSt please refer to https://community.tp-link.com/en/home/forum/topic/164924?page=1&t=2019%2F07%2F12%2007%3A13%3A00%20%2B0000

@JoSt Please ensure that the sim card support data roaming and enable this feature on the web UI of M7450. How to login to the web interface, click here Besides, you can create the profile manually...