@Sunshine Got it. Thank you! Hope TP-Link would be able to fix the ongoing intermittent 4G+ issue that's known with MR600 v2 which isn't a problem with v1 device as reported by several users.

Does carrier aggregation only work with TDD or TDD+FDD LTE bands? I noticed that when I select one or two FDD bands, 4G+ won't work at all. However, if I select even just 1 TDD band (band 40), 4G+...