When will firmware 17.5 become official?

[maverick#1]

Also, is there a problem with the website at the moment? I tried going to beyonwiz.com.au on my phone to check if the latest firmware was more recent than the one I have installed but I got a message saying "This web page has a redirect loop" on the default Chromium browser and a message saying "The page isn’t redirecting properly" on Firefox v59.

You were still able to go direct to the downloads section - https://beyonwiz.com.au/downloads/ (but the website is working now anyway).
The latest firmware for the U4 is available from the downloads section:
"Firmware
17.5-beyonwizu4-20180417"

The "Click Here to Download Firmware" link in the email also would have enabled you to download the linked file "beyonwiz-17.5-beyonwizu4-20180417_usb.zip" (or at least let you see that it was 20180417).

Thanks for the info.

I got the email but I don't like to follow links in emails, and the link wasn't beyonwiz.com.au/{something} (it was dealspace.us5.list-manage.com/track/click?{plus a bunch of numbers & lettters}, which looks much more like a phishing link than a Beyonwiz link), so I wanted to check the official website first.

Now that the website's back up, I'll check there.

Thanks!
Mav.

[prl]

...
I got the email but I don't like to follow links in emails, and the link wasn't beyonwiz.com.au/{something} (it was dealspace.us5.list-manage.com/track/click?{plus a bunch of numbers & lettters}, which looks much more like a phishing link than a Beyonwiz link), so I wanted to check the official website first.
...

Dealspace is where the Beyonwiz shop used to be, and clearly they still use it for some things. But not following email links you don't recognise is always a good idea.