Hi there !
I had some trouble reading my SMS on the MR600 router and I found a thread regarding this topic :
My understanding is that a beta firmware has been proposed first and then an official release (see an edit on 20/03/2020 by Kevin_Z).
But I can't find the official release, just the beta one that I have installed successfully (for the record, it fixes the SMS issue).
Could you clarify this situation please : is there an official release regarding this issue ? if yes, where to find it ?
Thanks also for your device, with the aid of my MR600, I have a 40Mbps connection far far in the countryside.