I have a Max BR1 Mk2 router with dual sim slots. The router recognises both UK sims but unfortunately I am unable to connect to the internet with either. I have tried the sims in my phone and a separate WiFi hot spot device. Internet streams fine with both sims on both devices. It all used to work with my Peplink router but no more! Can anyone suggest a fix - I guess it may be a settings problem but not sure why it just stopped working.
Since both SIM cards work fine in your phone and Wifi hotspot device, please check what is the APN for both SIM cards when they put into your phone and Wifi hotspot device. Then use the same APN with BR1 MK2.