@Beton Hello Sir, I have the MR600 and i never have any problem with it. I have a rock solid connection in France with Bouygues and SFR (Vodafone). I have it since the release of it. No issue at all.

@Beton Hi there, Yes, so this router doesn't want to donwgrade since it checks if it's a earlier version of the firwmare you try to flash... Sorry i have no more idea. You have to wait for a newer...

@Beton Hi there, And i think you have ever tried the automatic online update button in the advance / system tool menu?

@Beton Hi there, Have you ever performed a hard reset by pushing the reset bouton for about 5 secons until the device reboot? And after try to perform a stock firmware reflash?