@RajeshRaghav Hi, may I know which firmware you are trying to downgrade? and any issue with your current router? In addition, is your current firmware 220811 or 230811? is it this one: India Jio SIM...

@PolarBear68N Hi, please share with us screenshots of Advanced->Status page and also system log file saved on Advanced->System Tools->System Log page. If possible, please try a different SIM card to...

@ChrisDarkfire Please set DNS servers manually on Advanced->Network->LAN Settings page: If the problem still exists, please follow this guide for troubleshooting: LTE keeps disconnecting

@ash__10 Hi, the MR400 V3 doesn't support VoLTE and it cannot be added through firmware update only. For other ISPs, the SMS doesn't require VoLTE but as fer this thread, Jio does require VoLTE to...

@SharadT Hi, for 5G Jio SIM issue, please pay attention to this thread: India Jio SIM stops working on TP-Link LTE Gateway Routers after upgrading to 5G There is no beta firmware for MR200 V6 yet,...

@ZacMarc Hi, does it still happen randomly after scheduled reboot? Please check the Internet IPv4 address on the MR600 when it fails over to 4G backup, in case there is any IP conflict with the 4G...