@Anand_tr Hi, MR6400 etc. doesn't support firmware recovery, if there is no power, unable to connect or login its web interface anymore, it is recommended to try factory reset by holding reset button...

@sonn There is no firmware recovery tool for M7350 V5.x, if factory reset and reinserting battery doesn't help, it is recommanded to contact the seller where you bought it to check warranty.

@TpFanF Hi, we would like to escalate your case to the support engineers, and they will help follow it up, if you are willing to do further analysis, please check your inbox and respond.

@Cerelectric_pt Hi, Is your MR400 V4.2 EU version?

@Fetchinson Hi, I am afraid MR6400 and other TP-Link LTE routers cannot be restarted by SMS, how about reboot schedule which allows users to set a specific time to reboot automatically.

@TpFanF Hi, normally the LAN IP address will not change automatically unless the LAN and WAN IP addresses are in conflict. Could you please share with us screenshots of your LAN IP and Subnet Mask...