@Sam.T I have seen you accessed the page for Singapore. Indeed there is no any FW update. On the European version you can find the update but I would not do it if otherwise adviced by Tp-Link. I...

@Torgue Only the noip and dyndns are accepted. The account on noip is free of charge for 3 addresses but need to be confirmed every 30 days, you'll get 7 days notification. Once Dynamic DNS activated...

@Sam.T FW Version is not actual. Last available is 20190730. Upgrade and try.

@Guillaume_1978 You have only one Service Provider in your area? Better chose another one with 4G coverage in your area. With app "Network Cell Info Lite" from Play Store (free of charge) you can...

More details: https://www.tp-link.com/de/support/faq/1677/

Why you are not using Dynamic DNS? The noip is free (need to be confirmed every 30 days) and supported by mr200. Same for mr400 and mr6400. Full information available on faq of mr200 and also on...