@Bonoslav AX53 does support QoS, here is the guide: How to configure the HomeShield QoS feature on a TP-Link Router/Deco

@Tadayoshi If your ISP only use the frequencies that the antenna supports, that should be fine, or it might cause issues in other frequency bands.

@Atpra For 5G Jio SIM issue, there is no official solution for MR100 yet: India Jio SIM stops working on TP-Link LTE Gateway Routers after upgrading to 5G One user mentioned a solution but not sure...

@MerNion2 It seems MR600 has no V4 yet, maybe you mean another model?

@PiotrM If it happens on WiFi connection only, you could try changing wireless settings like WiFi channel and channel width. Also make sure the LTE bands are the same on the two routers. If the...

@Srip You could download its firmware here: Download for TL-MR100 | TP-Link