I also get the "Your firmware is up to date" message.

I don't understand. Has a new firmware been published for the C5400X? Can't find anything ...

@Kevin_Z I've been using the beta for a few months now and must say that the speed issue is gone. Funnily enough, the router's built-in speed test keeps on reporting lower than the 940 down/60 up...

@Kevin_Z Thank you! This time the download was successful.

@Kevin_Z Thank you! However, when I paste the link you sent me into my browser, I get redirected to a page with a message that "File does not exist".

@Kevin_Z Could you also send me the beta firmware, I'm experiencing the same issue? TIA