@Joohyun Can we confirm where did you get this 201112 version? What is the region version of the AX73, is it US or EU? Where did you purchase it? Why do you need to disable the WMM on the router?...

@Eugene29 As per the release note on the official TP-Link website, this firmware cannot be downgraded to the previous version: https://www.tp-link.com/support/download/archer-ax20/v1/#Firmware...

@Malkhan52 Hi, the MR600 does have a built-in SIM card slot, you can find this in the User Guide: https://static.tp-link.com/2021/202102/20210223/1910012928_Archer%20MR600(EU)_UG_REV2.0.0_V3.pdf...

@Aman132235 Do you mean you cannot receive or cannot view the messages? Could you please help to check the Message Center Number on Advanced->SMS->SMS Settings page with Jio SIM card? Is it possible...

@SanjitK Hi, please check the email and send us the system log on the C20, which should include that before and after the internet disconnects on the router.

@Eugene29 Firmware update was the only change in the network? If that is the case, please reset the AX20 to factory defaults by logging to its web interface page, then reconfigure it from scratch,...